CN112911716B - Data transmission method, device, equipment and storage medium - Google Patents
Data transmission method, device, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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 all transmission frequency points; and determining that the transmission paths are all current paths, calculating a transmission proportion when each current path is used for data transmission, distributing data to be transmitted to the corresponding current path according to the transmission proportion, and controlling data transmission between every two adjacent nodes in the corresponding current path according to corresponding transmission frequency points. The method can effectively avoid the interference between the nodes, 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 communications 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 between some nodes is increased frequently, and the interference between the other nodes is not generated, so that an effective frequency cannot be found in a frequency band range, and no interference exists between all nodes. 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;
determining that the transmission paths are all current paths, calculating the transmission proportion when each current path is used for data transmission, distributing the data to be transmitted to the corresponding current paths according to the transmission proportion, and controlling the data transmission between every two adjacent nodes in the corresponding current paths according to the corresponding transmission frequency points.
Preferably, before calculating the transmission ratio when data transmission is performed by using each current path, the method further includes:
the redundant capacity coefficient of each current path is calculated according to the following formula:
wherein t represents time, CW (t, L) represents a redundancy capacity coefficient of an arbitrary current path, lqy represents the total number of nodes included in the arbitrary current path, ca (t, lq (N-1), lq (N)) represents the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary current path, and a (w) (N) represents a redundancy weighting coefficient;
and selecting at least one current path with the minimum redundant capacity coefficient as a current path.
Preferably, before calculating the redundant capacity coefficient of each current path, the method further includes:
and calculating capacity coefficients corresponding to all nodes contained in each current path according to the following formula:
wherein CC (t, L) represents a capacity coefficient of an arbitrary current path;
and selecting at least one current path with the minimum capacity coefficient as a current path.
Preferably, the calculating the transmission ratio when the data transmission is performed by using each current path includes:
calculating the transmission proportion when each current path is used for data transmission according to the following formula:
where Cw (t) represents a transmission ratio of data to be allocated to an arbitrary current path to all data to be transmitted when data transmission is performed by using the arbitrary current path, CC (t, w) represents a capacity coefficient of the arbitrary current path, X1 represents the number of current paths, and CC (t, L) represents a capacity coefficient of the current 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,L Lq(N-1)Lq(N)kN )＝a Ca(t,L Lq(N-1)Lq(N)kN )+(1-a)Ca(t-1,L Lq(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.
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 each two adjacent nodes in each transmission path for data transmission 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 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.
Preferably, the controlling the data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency point includes:
and controlling data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
A data transmission apparatus comprising:
a first determining 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 transmission module to: determining that the transmission paths are all current paths, calculating the transmission proportion when each current path is used for data transmission, distributing the data to be transmitted to the corresponding current paths according to the transmission proportion, and controlling the data transmission between every two adjacent nodes in the corresponding current paths according to the corresponding transmission frequency points.
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 the computer program is executed.
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 all transmission frequency points; determining that the transmission paths are all current paths, calculating the transmission proportion when each current path is used for data transmission, distributing the data to be transmitted to the corresponding current paths according to the transmission proportion, and controlling the data transmission between every two adjacent nodes in the corresponding current paths 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, after the transmission proportion of different transmission paths for realizing data transmission is calculated, the data to be transmitted is proportionally distributed to different transmission paths for realizing data transmission, and the data transmission can be realized by utilizing a plurality of transmission paths so as to improve the transmission efficiency. Therefore, according to the method and the device, data transmission is achieved among different nodes in a mode of different frequency points and redundant paths, the interference among the nodes can be effectively avoided, meanwhile, the transmission efficiency is improved, and further the overall throughput rate performance of the system is remarkably 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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 name for a wireless ad hoc network MESH communication system, and the wireless ad hoc network system includes a plurality of wireless ad hoc networksFor any two nodes needing data transmission in the wireless ad hoc network system, the two nodes can be respectively used as a source node and a target node, and then data transmission is carried out between the source node and the target node. Specifically, it can be set that Y nodes and K frequency points exist in the wireless ad hoc network system, and any one of the K frequency points is supported to be selected between any two nodes for data transmission; setting the physical layer transmission mode between any two nodes as L ijk I and j are numbers of nodes and can take values from 1 to Y, namely i, j =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, namely K =1,2.. K; corresponding L ijk And the data transmission between the two nodes, namely the node i and the node j, is carried out by adopting the frequency point k.
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 a value from 1 to L, that is, q =1,2.. L; and the nodes passed by the Lq-th transmission path may be denoted as Lq (Nq), nq may take a value of 1 to Yqy, yqy is the total number of nodes included in the transmission path Lq, that is, nq =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 then determining that the channel capacity corresponding to the signal-to-noise ratio is the channel capacity for data transmission between the two nodes by adopting the arbitrary frequency point at the time t. 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 calculated Lq(N-1)Lq(N)kN ) N represents the number of the node, lq (N-1) and Lq (N) may represent nodes that hop through N-1 th in the Lq-th transmission path (i.e., N-1 th node and nth node, respectively), kN =1,2.. K, which represents different frequency points; to select the firstThe maximum value of the channel capacity of the node through which the N-1 th hop of Lq transmission paths passes can be expressed as:
at this time, kN values selected by Ca (t, lq (N-1), lq (N)) are kN (t, N), that is, lq (N-1) and Lq (N) may indicate frequency points adopted by nodes passing through N-1 th hop in the Lq-th transmission path during data transmission, and corresponding modulation modes may be indicated as L Lq(N-1)Lq(N)kN(t,N) 。
S13: and determining that the transmission paths are all current paths, calculating a transmission proportion when each current path is used for data transmission, distributing data to be transmitted to the corresponding current path according to the transmission proportion, and controlling data transmission between every two adjacent nodes in the corresponding current path according to corresponding transmission frequency points.
After the current path is determined, for data that needs to be transmitted between the source node and the target node, a ratio that needs to be transmitted according to each current path may be determined, and when data transmission between the source node and the target node is implemented based on the current path, only data of a transmission ratio corresponding to each current path may be allocated to the corresponding 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 the 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 adopted when the channel capacity between every two adjacent nodes is the maximum as a transmission frequency point through the channel capacity of adopting every frequency point to carry out data transmission between every two adjacent nodes in every transmission path, calculating the transmission proportion of each current path which needs to be responsible for realizing data transmission, distributing data which need to be transmitted between the source node and the target node to each current path according to the corresponding transmission proportion, 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, after the transmission proportion of different transmission paths for realizing data transmission is calculated, the data to be transmitted is proportionally distributed to different transmission paths for realizing data transmission, and the data transmission can be realized by utilizing a plurality of transmission paths so as to improve the transmission efficiency. Therefore, according to the method and the device, data transmission is achieved among different nodes in a mode of different frequency points and redundant paths, the interference among the nodes can be effectively avoided, meanwhile, the transmission efficiency is improved, and further the overall throughput rate performance of the system is remarkably improved.
Before calculating a transmission ratio when data transmission is performed by using each current path, the data transmission method provided by the embodiment of the present invention may further include:
calculating the redundancy capacity coefficient of each current path according to the following formula:
wherein t represents time, CW (t, L) represents a redundancy capacity coefficient of an arbitrary current path, lqy represents the total number of nodes included in the arbitrary current path, ca (t, lq (N-1), lq (N)) represents the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary current path, and a (w) (N) represents a redundancy weighting coefficient;
and selecting at least one current path with the minimum redundant capacity coefficient as a current path.
In order to make the performance of the transmission path utilized in data transmission better, the embodiments of the present application may further calculate redundancy capacity coefficients capable of representing the performance of the current paths, where a (w) (N) represents a redundancy weighting coefficient, which represents a weighting coefficient of the N-1 th hop of the current path w, and 0-restricted to a (w) (N); in one embodiment, if each current path includes the same branch path, that is, if at least two current paths select the same Lijk, a (w) (N) =1.5 may be set, otherwise, a (w) (N) =1 is set; finally, after the redundant capacity coefficient of each current path is determined, at least one current path with the minimum redundant capacity coefficient can be selected as a new current path.
Before calculating the redundant capacity coefficient of each current path, the data transmission method provided in the embodiment of the present invention may further include:
and calculating capacity coefficients corresponding to all nodes contained in each current path according to the following formula:
wherein CC (t, L) represents a capacity coefficient of an arbitrary current path;
and selecting at least one current path with the minimum capacity coefficient as a current path.
In order to further ensure that the selected current path is a path with a better performance condition, in the embodiment of the present application, before the current path is selected by using the redundant capacity coefficient, and after the current path is preliminarily determined, the capacity coefficient of the arbitrary transmission path may be obtained by performing comprehensive calculation based on the current channel capacity between each two adjacent nodes included in the arbitrary transmission path, so that the capacity coefficient may represent a total condition of the channel capacity that the arbitrary transmission path has when implementing data transmission between the source node and the target node, that is, to implement the performance condition of data transmission, and at least one (preferably, a plurality of) transmission paths with a better performance condition for implementing data transmission are selected as the current path from the transmission paths implementing data transmission between the source node and the target node based on the capacity coefficient, so as to implement data transmission based on the current path in the future, and implement data transmission by using the transmission paths with the better performance condition 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, several transmission paths with the largest capacity coefficient need to be selected as current paths; 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, several transmission paths with the smallest capacity coefficient need to be selected as the current path, so that after the performance condition of the transmission paths 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.
The data transmission method provided in the embodiment of the present invention calculates a transmission ratio when data transmission is performed by using each current path, and may include:
calculating the transmission proportion when each current path is used for data transmission according to the following formula:
where Cw (t) represents a transmission ratio of data to be allocated to an arbitrary current path to all data to be transmitted when data transmission is performed by using the arbitrary current path, CC (t, w) represents a capacity coefficient of the arbitrary current path, X1 represents the number of current paths, and CC (t, L) represents a capacity coefficient of the current path.
According to the embodiment of the application, when the transmission proportion of each current path in data transmission is calculated, effective calculation can be performed according to the formula; after the transmission proportion of each current path for data transmission is calculated, for any current path, a value obtained by multiplying the transmission proportion corresponding to the any current path by all data to be transmitted can be the amount of the data to be allocated to the any current path, and the current paths can simultaneously realize the transmission of the allocated data, so that the data transmission efficiency is further improved.
Before determining that the frequency points corresponding to the maximum current channel capacity between every two adjacent nodes are all 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,L Lq(N-1)Lq(N)kN )＝a Ca(t,L Lq(N-1)Lq(N)kN )+(1-a)Ca(t-1,L Lq(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 as 0-a-s-1.
The data transmission method provided in the embodiment of the present invention determines that the channel capacity of data transmission between every two adjacent nodes in each transmission path using each frequency point is the current channel capacity, and may include:
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.
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 a preferred embodiment, a worker may also obtain a corresponding fast calculation lookup table (i.e., a corresponding relationship table) indicating a corresponding relationship between a signal-to-noise ratio and a channel capacity in advance for different physical layer transmission modes, as shown in table 1, the fast calculation lookup table is a fast calculation lookup table indicating a corresponding relationship between a signal-to-noise ratio and a channel capacity when a physical layer transmission mode of the wireless ad hoc network system is 16QAM modulation, as shown in table 2, the fast calculation lookup table is a fast calculation lookup table indicating a corresponding relationship between a signal-to-noise ratio and a channel capacity when QPSK modulation is performed in the physical layer transmission mode of the wireless ad hoc network system, and thus, when it is required to determine a channel capacity corresponding to any signal-to-noise ratio, the signal-to-noise ratio of any wireless ad hoc network system can be directly located in the fast calculation lookup table, and then the channel capacity corresponding to the located 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 corresponding current path according to corresponding transmission frequency points, and may include:
and controlling data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency point in the time period determined by dividing the time slot based on the 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.
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:
setting Y nodes and K frequency points in a wireless ad hoc network system; any node supports the selection of any frequency point of K frequency points for transmission, 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 L ijk Y is a nodeNumber, K =1,2.. K is the frequency point selected between the two nodes of ij, L ijk And the two nodes representing i and j adopt a frequency point k for transmission.
And (2) setting L different transmission paths Lq, q =1,2.. L between two nodes needing transmission, wherein the node passed by the Lq path is Lq (Nq), nq =1,2.. Yqy, the total number of passed nodes is Yqy, setting a variable of the current path, and assigning the L transmission paths to the current path. Setting SNR (t, i, j, k) to represent signal-to-noise ratio when a kth frequency point is adopted to perform transmission between an ith node and a jth node at time t, where 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 capacity Lq(N-1)Lq(N)kN ) And Lq (N-1) and Lq (N) are nodes passed by the N-1 th hop on the Lq transmission path, and kN =1,2.
And (4) calculating the weighted channel capacity of different frequency points transmitted among the nodes according to the following formula:
Ca(t,L Lq(N-1)Lq(N)kN )＝a Ca(t,L Lq(N-1)Lq(N)kN )+(1-a)Ca(t-1,L Lq(N-1)Lq(N)kN ),
wherein 0 s are woven as a-woven fabric 1.
And (5) selecting the maximum value of the weighted channel capacity of different frequency points among the nodes according to the following formula:
wherein kN =1,2.. K represents different frequency points; correspondingly, ca (t, lq (N-1), lq (N)) selects kN value as kN (t, N), modulation mode is L Lq(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 a transmission path corresponding to the minimum X values of the capacity coefficient CC (t, L) as a candidate transmission path Lw to assign to the current path, so as to update the value of the current path, wherein w = i,2.. X.
Step (8) calculates the redundant capacity coefficients of the X candidate transmission paths according to the following formula:
wherein A (w) (N) is a redundant capacity coefficient, represents the N-1 st hop weighting coefficient of the candidate transmission path Lw, and 0 is constructed from A (w) (N).
And (9) selecting the candidate transmission path Lw corresponding to the minimum X1 value from the redundancy capacity coefficients of the X candidate transmission paths calculated in the step (8) as a final redundancy path L (t), and assigning the final redundancy path L (t) to the current path to update the value of the current path.
Step (10) calculates the transmission ratio of each final redundant path according to the following formula:
step (11) takes X1L (t) selected in step (9) as final redundant paths, the transmission proportion of data transmission of each final redundant path is distributed according to step (10), and the transmission frequency point and the physical layer transmission mode among nodes in each final redundant path are according to kN (t, N) and L (t, N) in step (5) Lq(N-1)Lq(N)kN(t,N) And carrying out data transmission.
In another embodiment, each node in the wireless ad hoc network system transmits and receives by using an orthogonal frequency division multiplexing, OFDM, technique for communication. The wireless ad hoc network system is set to have 8 nodes and 3 frequency points, any node supports to select any frequency point of the 3 frequency points for transmission, and the transmission between different nodes is carried out by dividing time slots according to a TDMA system. The method comprises the steps that 2 physical layer transmission modes 16QAM and QPSK are supported in a wireless ad hoc network system, the physical layer transmission mode is Lijk, i, j =1,2.. 8 is a node number, k =1,2,3 is frequency points selected between two ij nodes, and the interval of each frequency point 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 =1,2.. L, the nodes passed by the Lq path are Lq (Nq), nq =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 the channel capacity CakN (t, lq (N-1), lq (N)) transmitted between nodes of L different paths transmitted from Y1 to Y2 by using SNR (t, i, j, k) through 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 =1,2,3 represents 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:
Calculating capacity coefficients CC (t, L) of different paths, wherein t represents time:
and (6) selecting the minimum X values of the capacity coefficients CC (t, L) as candidate transmission paths Lw, w = i,2.. X.
Step (7) calculates the redundant capacity coefficients of the 4 candidate transmission paths:
The values of A (w) (N) are as follows: if there are the same branch paths in the 4 candidate transmission paths, that is, the two candidate transmission paths select the same Lijk, then a (w) (N) =1.5, otherwise a (w) (N) =1.
And (8) selecting the candidate transmission path Lw corresponding to the minimum 2 values from the 4 candidate transmission path redundancy capacity coefficients calculated in the step (7) as the final redundancy path L (t).
And (9) calculating the transmission proportion of 2 final redundant paths:
step (10) takes the 2L (t) selected in step (8) as the final redundant paths, the data transmission proportion of each final redundant path is distributed according to step (9), and the transmission frequency point and the physical layer transmission mode between nodes in the final redundant paths are according to the kN (t, N) and L in step (4) Lq(N-1)Lq(N)kN(t,N) And carrying out transmission.
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 redundant path transmission between different nodes in the wireless ad hoc network by using different frequencies can ensure that part of nodes with interference use other frequencies and paths for transmission 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 all transmission frequency points;
a transmission module 13 configured to: and determining that the transmission paths are all current paths, calculating a transmission proportion when each current path is used for data transmission, distributing data to be transmitted to the corresponding current path according to the transmission proportion, and controlling data transmission between every two adjacent nodes in the corresponding current path according to corresponding transmission frequency points.
The data transmission apparatus provided in the embodiment of the present invention may further include:
a second selection module for: before calculating the transmission proportion when each current path is used for data transmission, the method further comprises the following steps:
the redundant capacity coefficient of each current path is calculated according to the following formula:
wherein t represents time, CW (t, L) represents a redundancy capacity coefficient of an arbitrary current path, lqy represents the total number of nodes included in the arbitrary current path, ca (t, lq (N-1), lq (N)) represents the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary current path, and a (w) (N) represents a redundancy weighting coefficient; and selecting at least one current path with the minimum redundant capacity coefficient as a current path.
In an embodiment of the data transmission apparatus provided in the present invention, a transmission module may include:
a ratio calculation unit for: calculating the transmission proportion when each current path is used for data transmission according to the following formula:
where Cw (t) represents a transmission ratio of data to be allocated to an arbitrary current path to all data to be transmitted when data transmission is performed by using the arbitrary current path, CC (t, w) represents a capacity coefficient of the arbitrary current path, X1 represents the number of current paths, and CC (t, L) represents a capacity coefficient of the current path.
The data transmission device provided in the embodiment of the present invention may further include:
a first selection module to: before calculating the redundant capacity coefficient of each current path, the method further comprises the following steps:
calculating the capacity coefficient corresponding to all nodes contained in each current path according to the following formula:
wherein CC (t, L) represents a capacity coefficient of an arbitrary current path; and selecting at least one current path with the minimum capacity coefficient as a current path.
The data transmission apparatus provided in the embodiment of the present invention may further include:
a third determination module to: 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,L Lq(N-1)Lq(N)kN )＝a Ca(t,L Lq(N-1)Lq(N)kN )+(1-a)Ca(t-1,L Lq(N-1)Lq(N)kN )，
wherein, ca (t, L) Lq(N-1)Lq(N)kN ) 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 is represented, and a represents a weighted coefficient; and determining the weighted channel capacity of each two adjacent nodes in each transmission path for data transmission 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 determination unit configured to: determining the signal-to-noise ratio of each two adjacent nodes in each transmission path for data transmission 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 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.
In an embodiment of the present invention, a transmission module of a data transmission apparatus includes:
a transmission unit to: and controlling data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency point in a time interval determined by dividing time slots based on a TDMA system.
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 the computer program is executed.
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 (9)
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 all transmission frequency points;
determining that the transmission paths are all current paths, calculating a transmission proportion when each current path is used for data transmission, distributing data to be transmitted to the corresponding current path according to the transmission proportion, and controlling data transmission between every two adjacent nodes in the corresponding current path according to corresponding transmission frequency points;
before calculating the transmission proportion when each current path is used for data transmission, the method further comprises the following steps:
calculating the redundancy capacity coefficient of each current path according to the following formula:
wherein t represents time, CW (t, L) represents a redundancy capacity coefficient of an arbitrary current path, lqy represents the total number of nodes included in the arbitrary current path, ca (t, lq (N-1), lq (N)) represents the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary current path, and a (w) (N) represents a redundancy weighting coefficient;
and selecting at least one current path with the minimum redundant capacity coefficient as a current path.
2. The method of claim 1, wherein before calculating the redundant capacity coefficient for each current path, further comprising:
and calculating capacity coefficients corresponding to all nodes contained in each current path according to the following formula:
wherein CC (t, L) represents a capacity coefficient of any current path;
and selecting at least one current path with the minimum capacity coefficient as a current path.
3. The method of claim 2, wherein calculating the transmission ratio for data transmission using each current path comprises:
calculating the transmission proportion when each current path is used for data transmission according to the following formula:
where Cw (t) represents a transmission ratio of data to be allocated to an arbitrary current path to all data to be transmitted when data transmission is performed by using the arbitrary current path, CC (t, w) represents a capacity coefficient of the arbitrary current path, X1 represents the number of current paths, and CC (t, L) represents a capacity coefficient of the current path.
4. The method of claim 3, 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,L Lq(N-1)Lq(N)kN )＝a Ca(t,L Lq(N-1)Lq(N)kN )+(1-a)Ca(t-1,L Lq(N-1)Lq(N)kN )，
wherein, ca (t, L) Lq(N-1)Lq(N)kN ) 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 is represented, 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.
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 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.
6. The method of claim 5, wherein controlling data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency points comprises:
and controlling data transmission between every two adjacent nodes in the corresponding current path according to the corresponding transmission frequency point in the time period determined by dividing the time slot based on the TDMA system.
7. 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 all transmission frequency points;
a transmission module to: determining that the transmission paths are all current paths, calculating a transmission proportion when each current path is used for data transmission, distributing data to be transmitted to the corresponding current path according to the transmission proportion, and controlling data transmission between every two adjacent nodes in the corresponding current path according to corresponding transmission frequency points;
a second selection module to: before calculating the transmission proportion when each current path is used for data transmission, the method further comprises the following steps:
the redundant capacity coefficient of each current path is calculated according to the following formula:
wherein t represents time, CW (t, L) represents a redundancy capacity coefficient of an arbitrary current path, lqy represents the total number of nodes included in the arbitrary current path, ca (t, lq (N-1), lq (N)) represents the maximum current channel capacity between the N-1 st node and the N-th node in the arbitrary current path, and a (w) (N) represents a redundancy weighting coefficient; and selecting at least one current path with the minimum redundant capacity coefficient as a current path.
8. 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 6 when executing the computer program.
9. 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 6.
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