CN114071489B - Communication node pairing method, device, communication node and storage medium - Google Patents

Abstract

The application discloses a communication node pairing method, a device, a communication node and a storage medium. The method comprises the following steps: the first communication node acquires channel information of K second communication nodes; k is an integer greater than or equal to 2; selecting a second communication node which meets a preset condition with the position of the second communication node from the K second communication nodes according to the acquired channel information of the K second communication nodes, and obtaining Q communication nodes to be paired; q is an integer less than K; according to the allocation strategy, allocating a mode for each communication node in the Q communication nodes to be paired; and pairing among the Q communication nodes to be paired by using the modality and channel information of the Q communication nodes to be paired.

Description

Communication node pairing method, device, communication node and storage medium

Technical Field

The present application relates to the field of wireless communication technology, and in particular to a communication node pairing method, device, communication node and storage medium.

Background Art

Multiple-Input Multiple-Output (MIMO) technology is a key technology of the Long Term Evolution (LTE) system, which can greatly improve spectrum efficiency. However, due to the hardware conditions of the terminal, the actual application of terminal multi-antenna reception is difficult to meet. In order to solve this problem, virtual MIMO technology (VMIMO) is proposed in the LTE system. VMIMO allows at least two users to pair up and use the same video resources to transmit data to obtain spatial multiplexing gain. Therefore, user pairing technology is one of the key technologies of VMIMO. Common user pairing methods include: random user pairing (RPS), orthogonal user pairing (OPS), and proportional fairness (PF).

However, in the related art, the pairing scheme is relatively complicated and requires pairing calculations for all users in the system, which will bring additional time overhead when there are many system users; and there is a certain degree of difficulty in processing the pairing of multiple users in the same direction.

Summary of the invention

To solve related technical problems, the embodiments of the present application provide a communication node pairing method, device, communication node and storage medium.

The technical solution of the embodiment of the present application is implemented as follows:

The embodiment of the present application provides a communication node pairing method, which is applied to a first communication node, including:

Acquire channel information of K second communication nodes; N is an integer greater than or equal to 2;

According to the acquired channel information of the K second communication nodes, a second communication node whose position satisfies a preset condition is selected from the K second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K;

According to the allocation strategy, a mode is allocated to each of the Q communication nodes to be paired;

Pairing is performed between the Q communication nodes to be paired using the mode and channel information of the Q communication nodes to be paired.

In the above scheme, when pairing is performed between the Q communication nodes to be paired using the modalities and channel information of the Q communication nodes to be paired, the method includes:

Select a communication node from the communication nodes to be paired, determine an OPS channel between the selected communication node and at least one other communication node among the communication nodes to be paired except the selected communication node using the mode and channel information of the communication node to be paired; and determine a channel correlation matrix corresponding to the OPS channel;

The selected communication node is paired from the at least one other communication node to be paired using the first element in the determined channel correlation matrix; the first element is an element that can reflect the channel correlation between the selected communication node and the corresponding communication node.

In the above solution, the using the first element in the determined channel correlation matrix to pair the selected communication node from the at least one other communication node to be paired includes:

For each first element of at least one first element corresponding to the at least one other communication node to be paired, take the F norm of the corresponding first element to obtain at least one processing result;

A communication node corresponding to a smallest processing result among at least one processing result is selected as a paired communication node of the selected communication node.

In the above scheme, when the minimum processing result is less than or equal to the preset threshold, the communication node corresponding to the minimum processing result is paired with the selected communication node.

In the above scheme, when determining the OPS channel between the selected communication node and at least one other communication node to be paired among the communication nodes to be paired except the selected communication node, the method includes:

For one communication node among the other at least one communication node to be paired, respectively perform discrete Fourier transform (DFT) precoding on the initial channels of the selected communication node and the corresponding communication node to obtain equivalent orbital angular momentum (OAM) channels of the selected communication node and the corresponding communication node;

The obtained equivalent OAM channel is used to determine the corresponding OPS channel.

In the above scheme, the performing DFT precoding on the initial channels of the selected communication node and the corresponding communication node respectively to obtain the equivalent OAM channels of the selected communication node and the corresponding communication node includes:

Using the selected communication node and the channel information of the corresponding communication node, respectively determine the corresponding channel matrices to obtain two channel matrices;

Using the selected communication node and the mode of the corresponding communication node, respectively determine the corresponding discrete Fourier transform DFT matrices to obtain two DFT matrices;

An equivalent OAM channel between the selected communication node and a corresponding communication node is determined using two channel matrices and two DFT matrices.

In the above scheme, the allocation strategy for allocating a mode to each of the Q communication nodes to be paired includes one of the following:

A mode is assigned to each of the Q communication nodes to be paired by random assignment;

According to the order of the modes in the set, a mode is assigned to each communication node in the Q communication nodes to be paired;

According to the order of priority of the communication nodes, a mode is assigned to each of the Q communication nodes to be paired;

A mode is pre-assigned to each of the Q communication nodes to be paired, and whether the pre-assigned mode is the optimal mode is determined according to the optimal strategy. If the pre-assigned mode is the optimal mode, the pre-assigned mode is used as the mode of the corresponding communication node.

In the above scheme, the method further includes:

Notify the Q communication nodes to be paired of the assigned mode.

The embodiment of the present application also provides a communication node pairing device, including:

An acquisition unit, configured to acquire channel information of K second communication nodes; K is an integer greater than or equal to 2;

A selection unit is used to select, according to the acquired channel information of the K second communication nodes, a second communication node whose position with the first communication node meets a preset condition from the K second communication nodes, to obtain Q communication nodes to be paired; Q is an integer less than K;

An allocating unit, configured to allocate a mode to each of the Q communication nodes to be paired according to an allocation strategy;

The pairing unit performs pairing between the Q communication nodes to be paired using the mode and channel information of the Q communication nodes to be paired.

The embodiment of the present application further provides a communication node, including: a processor and a communication interface; wherein the processor is used to:

Acquire channel information of K second communication nodes through the communication interface; K is an integer greater than or equal to 2;

According to the acquired channel information of the K second communication nodes, a second communication node whose position satisfies a preset condition with the communication node is selected from the K second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K;

According to the allocation strategy, a mode is allocated to each of the Q communication nodes to be paired;

Pairing is performed between the Q communication nodes to be paired using the mode and channel information of the Q communication nodes to be paired.

The embodiment of the present application also provides a communication node, comprising: a processor and a memory for storing a computer program that can be run on the processor,

Wherein, the processor is used to execute the steps of any of the above methods when running the computer program.

An embodiment of the present application further provides a storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above methods when executed by a processor.

The communication node pairing method, device, communication node and storage medium provided by the embodiment of the present application, the first communication node obtains the channel information of K second communication nodes; K is an integer greater than or equal to 2; according to the channel information of the K second communication nodes obtained, a second communication node that meets the preset conditions with its own position is selected from the multiple second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K; according to the allocation strategy, a mode is allocated to each communication node in the Q communication nodes to be paired; using the mode and channel information of the Q communication nodes to be paired, pairing is performed between the Q communication nodes to be paired, because the second communication node that meets the preset conditions with its own position is selected from the multiple second communication nodes, that is, the nodes that meet the pairing conditions are selected for pairing, and it is not necessary to pair all nodes, so that when there are many system nodes, the time overhead will be greatly reduced. At the same time, the scheme of the embodiment of the present application is adopted, because the second communication node that meets the preset conditions with the first communication node position is selected from the multiple second communication nodes for pairing, so the pairing of multiple nodes in the same direction is achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a user pairing process in the related art;

FIG2 is a schematic diagram of a specific implementation flow of step 103 in FIG1 ;

FIG3 is a schematic diagram of a method flow chart of pairing communication nodes according to an embodiment of the present application;

FIG4 is a schematic diagram of an OAM transmission system model according to an embodiment of the present application;

FIG5 is a schematic diagram of an OAM transmission system for node pairing according to an embodiment of the present application;

FIG6 is a schematic diagram of a process of user pairing based on OAM in an application embodiment of the present application;

FIG7 is a schematic diagram of the structure of a communication node pairing device according to an embodiment of the present application;

FIG8 is a schematic diagram of the communication node structure of an embodiment of the present application.

DETAILED DESCRIPTION

The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

In the related art, the pairing scheme adopted is as follows:

Assume a MIMO uplink system, the base station has two antennas, and there are two single-antenna users in the cell. Assuming they have been paired successfully, the channel matrix of the 2×2 VMIMO system is as follows:

Among them, _H1 and _H2 represent the channel matrices formed by two configured users and the base station respectively, and these two paired user channels are independent of each other. At this time, the received signal vector at the base station can be written as:

Where _x1 and _x2 represent the transmission signals of two paired users, and n represents Gaussian white noise.

Orthogonal pairing selects users whose channels are most consistent with orthogonal characteristics for pairing, and then transmits user data through the same resource block. Through the system channel matrix H, its cross-correlation channel matrix F is calculated as:

The orthogonal factor D of two users obtained from F is:

Where tr(·) represents the trace of the matrix F, and D is a factor to measure the orthogonality of the channel. The larger the D value, the better the orthogonality. The user pairing process of OPS using the above principle is shown in Figure 1 and includes the following steps:

Step 101: The base station obtains channel information of all users in the system, and all users to be assigned form a queue;

Step 102: The base station selects a user from the queue;

Among them, the user can be selected using random selection, sequential selection, priority selection and other methods.

Step 103: The base station determines an orthogonality factor D between the user and other users in the queue;

Step 104: The base station selects two users with the largest orthogonality factor D as paired users, and deletes these two users from the queue;

Step 105: Determine whether all users in the queue have completed pairing. If not, continue to step 102, otherwise, execute 106;

Step 106: Output the pairing result. The base station performs pairing on the user according to the pairing result, and ends the current outflow.

That is to say, when all users are matched, the processing flow ends.

As shown in FIG2 , the process of determining the orthogonal factor D between the user and other users in the queue includes:

Step 1031: The base station constructs a channel matrix H of two users (the user and one of the remaining users in the queue);

Specifically, the channel matrices H ₁ and H ₂ of the two users obtained in step 101 are used to construct H using formula (1).

Step 1032: The base station calculates the cross-correlation matrix F according to the channel matrix H;

Specifically, the cross-correlation matrix F is calculated by formula (3).

Step 1033: The base station determines the orthogonal factor D of the two users according to the obtained mutual correlation matrix F.

Specifically, the orthogonal factor D of the two users is calculated by formula (4).

As can be seen from the above description, the above pairing scheme is relatively complicated and requires pairing calculations for all users in the system, which will bring additional time overhead when there are many system users.

In addition, the above pairing scheme is a MIMO-based transmission scheme, which makes it difficult to pair multiple users in the same direction.

On the other hand, in the past few decades, the demand for mobile data rates has become increasingly higher, and the problem of spectrum resource shortage has become increasingly apparent. People use multiplexing technologies such as frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM) to gradually improve spectrum efficiency. How to further improve spectrum efficiency has become the focus of academic attention in the future. Orbital angular momentum (OAM), as an inherent physical property of electromagnetic waves, can continue to improve spectrum utilization from another dimension of multiplexing. According to classical electromagnetic theory, electromagnetic radiation contains both spin angular momentum (SAM) and orbital angular momentum. SAM represents the left-handed and right-handed circular polarization of electromagnetic waves, and OAM means that the energy of electromagnetic waves rotates along the transmission direction. Therefore, electromagnetic waves carrying OAM are also called vortex electromagnetic waves.

OAM adds a phase rotation factor to the normal electromagnetic wave. At this time, the phase wavefront will no longer be a planar structure, but rotate around the propagation direction of the beam, that is, a vortex electromagnetic wave. The electromagnetic wave carrying OAM can be expressed by the following formula:

Where l represents the eigenvalue of orbital angular momentum, also called modal value or order; A(r) represents the amplitude of the electromagnetic wave, and r represents the straight-line distance to the center of the beam; is the azimuth angle. Similar to FDM, TDM, and CDM, the orbital angular momentum of electromagnetic waves provides another multiplexing dimension l. Electromagnetic vortex waves with different eigenvalues l in the axial direction are orthogonal to each other. Therefore, OAM vortex waves with different eigenvalues can be transmitted in parallel within the same bandwidth, and in theory, l can take any value, that is, it can be multiplexed infinitely.

Based on this, OAM can be used to transmit electromagnetic waves, and the antennas used may include: uniform circle array (UCA), spiral phase panel and spiral parabolic antenna, etc.

In various embodiments of the present application, communication nodes are paired based on electromagnetic wave OAM.

The communication node pairing method provided in the embodiment of the present application is applied to the first communication node, as shown in FIG3, and includes the following steps:

Step 301: Acquire channel information of K second communication nodes; K is an integer greater than or equal to 2;

Step 302: According to the acquired channel information of the K second communication nodes, a second communication node whose position satisfies a preset condition is selected from the K second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K;

Step 303: assigning a mode to each of the Q communication nodes to be paired according to the assignment strategy;

Step 304: Pairing is performed between the Q communication nodes to be paired using the mode and channel information of the Q communication nodes to be paired.

In actual application, the first communication node may be a base station, and correspondingly, the second communication node may be a terminal. The first communication node may also be a relay node or a base station in a relay scenario, and correspondingly, the second communication node may be a relay node in a relay scenario.

In step 301, the channel information may also be referred to as channel state information (CSI). In the scenario of base stations and terminals, CSI is the channel state information used by the terminal to feed back the downlink channel quality to the gNB, so that the base station can select a suitable modulation and coding strategy (MCS) for the transmission of downlink data and reduce the block error rate (BLER) of downlink data transmission. In actual application, the second communication node may send a reference signal to the first communication node, and the first communication node may obtain the channel information by receiving the reference signal, or may obtain the CSI by using the CSI measurement and reporting method in the related technology.

In a relay scenario, channel information can also be obtained in the above manner.

It should be noted that the embodiments of the present application do not limit the specific implementation process of obtaining channel information.

In step 302, in actual application, the location of the first communication node satisfies the preset condition and may include one of the following:

OAM transmission characteristics (also known as OAM transmission conditions);

Coaxial with the first communication node antenna;

The same direction as the first communication node;

Align with the first communication node (receive and transmit alignment).

It can be seen from the above description that the preset conditions are described from different perspectives.

Among them, the first communication node determines whether the second communication node is coaxial with its own antenna according to the second communication node receiving signal strength and the second communication node receiving signal phase in the channel information. Among them, after coaxial and aligned, the total energy received by each antenna of the receiving end from the transmitting antenna should be equal, and the phase of the signal received by all receiving antennas of the receiving end should also be equal. However, in actual application, there will be certain errors. Therefore, for a second communication node, when the difference between the received signal strength corresponding to the coaxial alignment and the difference between the received signal phase and the coaxial alignment is within a certain range (which can be determined by experiment), it can be considered to be coaxial with the first communication node antenna.

FIG4 is a schematic diagram of an OAM transmission system model using UCA antennas. As shown in FIG4 , in the OAM transmission system model, the transmitting and receiving antenna arrays are coaxially parallel. The transmitting end (ie, Tx) has M antenna units, and the receiving end (Rx) has N antenna units. The M antenna units of the transmitting end are evenly distributed on a ring with a radius of r, and the N antenna units of the receiving end are evenly distributed on a ring with a radius of R. Assume that the angle of the transmitting antenna unit is θ, and the angle of the receiving antenna unit is Therefore, the angle of the mth transmitting unit is θ _m , and the angle of the nth receiving unit is Therefore, the selection of a second communication node coaxial with its own antenna from the multiple second communication nodes means that the centers of the antennas of the first communication node and the selected second communication node are both located on a certain axis. Of course, in actual application, when the distance between the axis where the center of the first communication node antenna is located and the axis where the center of the selected second communication node antenna is located is less than or equal to a preset distance (which can be set as needed), it is considered that the centers of the antennas of the first communication node and the selected second communication node are both located on a certain axis. The second communication node coaxial with the first communication node antenna can also be called a second communication node in the same direction as the first communication node.

The premise of using UCA antennas to transmit OAM electromagnetic waves is that the transmit power on each antenna unit must be equal when transmitting a certain mode. In addition, by adding a phase factor to each transmitting antenna unit, a spiral electromagnetic wave carrying OAM can be generated. For this operation, in a traditional MIMO system, an additional DFT matrix can be performed.

In step 303, in actual application, there are multiple ways of allocating the modalities, including:

The first method is to use a random allocation method to assign a mode to each of the Q communication nodes to be paired;

The second method is to assign a mode to each of the Q communication nodes to be paired according to the order of the modes in the set; this method can also be called a pre-assignment method.

The third method is to assign a mode to each of the Q communication nodes to be paired according to the order of the communication node priority;

The fourth method is to pre-allocate a mode for each of the Q communication nodes to be paired, and determine whether the pre-allocated mode is the optimal mode based on the optimal strategy. If the pre-allocated mode is the optimal mode, the pre-allocated mode is used as the mode of the corresponding communication node.

Among them, the first method is a pre-allocation method, that is, a random algorithm is used to allocate a mode to each communication node in the Q communication nodes to be paired from the mode set.

The second method is a pre-allocation method. All nodes can share a modal set. The modal set is generally {…, -3, -2, -1, 0, 1, 2, 3, …}. In actual application, in order to ensure the transmission rate, the modal set can be more appropriately in the range of -3 to +3, that is, the modal set is {-3, -2, -1, 0, 1, 2, 3}. The first communication node can allocate modalities to each of the Q communication nodes to be paired according to the order of the modes in the modal set {-3, -2, -1, 0, 1, 2, 3}.

The third method is a pre-allocation method, that is, according to the priorities of the second communication nodes detected in advance, a mode with a higher transmission rate is allocated to the second communication node with a higher priority, wherein the higher the priority, the smaller the absolute value of the allocated mode.

For the fourth method, it can be obtained according to the traversal method or special algorithm. For example, it can be determined whether the allocated mode is the optimal mode according to the size of the system and the rate, and the mode corresponding to the highest system and rate is selected as the mode of the second communication node.

In actual application, after the modes are assigned to the Q communication nodes to be paired, the corresponding communication nodes need to be notified of the assigned modes in order to perform information transmission.

The assigned mode may be notified to the corresponding communication node by transmitting a broadcast signal.

In order to facilitate the analysis of the node pairing situation, an OAM transmission system with two node pairings as shown in Figure 5 is assumed. The centers of the two receiving ends (Rx1 and Rx2) and one transmitting end (Tx) are all located on an axis, and the three planes are parallel. The transmitting end has M antenna units, and the two receiving ends each have N antenna units. The transmitting end can transmit multiple modes at the same time, wherein Rx1 and Rx2 use their respective mode sets L ₁ and L ₂ for transmission (when allocating modes, at least one mode can be allocated to the receiving end, and when multiple modes are allocated, multiple modes form a mode set), and the distances between Rx1 and Rx2 and the transmitting end are Z1 and Z2, respectively. In the figure in the upper right corner of Figure 5, when the OAM wave emitted by TX is a spiral wave and is allocated to two different modes of Rx1 and Rx2, the figure on the left represents the phase reception of the corresponding receiving end; the figure on the right represents the field strength reception.

Assume that the signals sent to the two receiving ends are and That is, the symbol vectors sent to the two receiving ends are generally considered to be vectors in complex space, with dimensions of L1×1 and L2×1 respectively. Then the OAM transmission system is:

in, and Respectively represent the received signal vectors of Rx1 and Rx2, and are the channel matrices of Rx1 and Rx2 respectively, Z is Gaussian white noise, and They are the DFT precoding matrices corresponding to Rx1 and Rx2, which are used to generate OAM electromagnetic waves. The construction is as follows:

Among them, the element middle The “1” in the upper right corner indicates that this is the mode used by Rx1, and the “i” in the lower right corner (i.e. the character in the lower right corner) indicates that Rx1 uses the i-th mode in its mode set L1 for transmission.

The construction is as follows:

Among them, the element middle The "2" in the upper right corner indicates that this is the mode used by Rx2, and the "i" in the lower right corner (that is, the character in the lower right corner) indicates that Rx2 uses the i-th mode in its mode set L2 for transmission.

Therefore, the equivalent OAM channel H of the original channel after DFT precoding is:

Among them, H _OAM,11 represents the OAM channel between Tx and Rx1; H _OAM,12 represents the original channel from Tx to Rx1 multiplied by the DFT used by Rx2; H _OAM,21 represents the original channel from Tx to Rx2 multiplied by the DFT used by Rx1; H _OAM,22 represents the OAM channel between Tx and x2.

According to the obtained OAM equivalent channel, the OPS channels of the two receiving ends are constructed as follows:

Calculate the channel correlation matrix F according to the OPS channel, then we have;

Among them, _F12 and _F21 reflect the channel relationship between Rx1 and Rx2, so these two parameters can be used as the basis for pairing.

When Rx1 uses mode l1 and Rx2 uses mode l2, F ₁₂ equals:

in, Represents the channel from the nth antenna of Rx1 to the mth antenna of Tx; Represents the channel from the nth antenna of Rx2 to the mth antenna of Tx.

When Rx1 uses mode l1 and Rx2 uses mode l2, F ₂₁ equals:

in, and is affected by the distance, so _F12 and _F21 are matrices about Z1 and Z2.

Taking the F norm for F ₁₂ , we have:

||F ₁₂ || _F ≤γ _th (14)

When it is less than a certain threshold, namely, γ _th , it is considered that the two Rx located at positions Z1 and Z2 can be paired.

Correspondingly, if we use F ₂₁ and take the F norm of F ₂₁ , we have:

||F ₂₁ || _F ≤λ _th (15)

When it is less than a certain threshold, namely, λ _th , it is considered that the two Rx located at positions Z1 and Z2 can be paired.

The above threshold can be set according to the actual minimum rate requirement of the system.

Based on the above theory, pairing is performed between the Q communication nodes to be paired.

Based on this, in one embodiment, when pairing between the Q communication nodes to be paired using the modalities and channel information of the Q communication nodes to be paired, the method includes:

Selecting a communication node from the Q communication nodes to be paired, determining an OPS channel between the selected communication node and Q-1 communication nodes other than the selected communication node among the Q communication nodes to be paired using the modalities and channel information of the Q communication nodes to be paired; and determining a channel correlation matrix corresponding to the OPS channel;

The selected communication node is paired from Q-1 communication nodes using the first element in the determined channel correlation matrix.

The first element is an element that can reflect the channel correlation between the selected communication node and the corresponding communication node, specifically the element in the first row and second column of the determined channel correlation matrix, or the element in the second row and first column, that is, _F12 or _F21 in the above formula (11).

In one embodiment, when determining the OPS channel between the selected communication node and Q-1 communication nodes to be paired except the selected communication node among the Q communication nodes to be paired, the method includes:

For one of the Q-1 communication nodes to be paired, DFT precoding is performed on the initial channels of the selected communication node and the corresponding communication node respectively to obtain equivalent OAM channels of the selected communication node and the corresponding communication node;

The obtained equivalent OAM channel is used to determine the corresponding OPS channel.

In one embodiment, performing DFT precoding on the selected communication node and the initial channel of the corresponding communication node respectively to obtain the equivalent OAM channel of the selected communication node and the corresponding communication node includes:

Using the selected communication node and the channel information of the corresponding communication node, respectively determine the corresponding channel matrices to obtain two channel matrices;

Using the selected communication node and the mode of the corresponding communication node, respectively determine the corresponding DFT matrices to obtain two DFT matrices;

An equivalent OAM channel between the selected communication node and a corresponding communication node is determined using two channel matrices and two DFT matrices.

Here, the above formula (9) is used to calculate the equivalent OAM channel between the selected communication node and the corresponding communication node; and the above formula (10) is used to determine the corresponding OPS channel.

In one embodiment, the using the first element in the determined channel correlation matrix to pair the selected communication node from Q-1 communication nodes to be paired includes:

For each first element of the Q-1 first elements, take the F norm of the corresponding first element to obtain M-1 processing results;

A communication node corresponding to the smallest processing result among the Q-1 processing results is selected as a paired communication node of the selected communication node.

Here, in the case that the minimum processing result is less than or equal to a preset threshold, the communication node corresponding to the minimum processing result is paired with the selected communication node.

That is to say, two nodes can be paired only when formula (13) or formula (14) is satisfied.

The communication node corresponding to the minimum processing result is paired with the paired communication node of the selected communication node, that is, the two communication nodes with the lowest channel correlation.

In actual application, the two successfully paired communication nodes are deleted from the Q communication nodes to be paired, and then the above method is used to pair the other unpaired communication nodes.

Based on this, in one embodiment, when pairing between the Q communication nodes to be paired using the modalities and channel information of the Q communication nodes to be paired,

Select a communication node from the communication nodes to be paired, determine an OPS channel between the selected communication node and at least one other communication node among the communication nodes to be paired except the selected communication node using the mode and channel information of the communication node to be paired; and determine a channel correlation matrix corresponding to the OPS channel;

The selected communication node is paired from the at least one other communication node to be paired using the first element in the determined channel correlation matrix; the first element is an element that can reflect the channel correlation between the selected communication node and the corresponding communication node.

In actual application, when Q is an odd number, the remaining second communication node is not paired.

Of course, in actual application, the Q needs to be greater than or equal to 2 so that the solution of the embodiment of the present application can be implemented.

In one embodiment, the using the first element in the determined channel correlation matrix to pair the selected communication node from the other multiple communication nodes to be paired includes:

For each first element of at least one first element corresponding to the at least one other communication node to be paired, take the F norm of the corresponding first element to obtain at least one processing result;

A communication node corresponding to a smallest processing result among at least one processing result is selected as a paired communication node of the selected communication node.

Here, in the case that the minimum processing result is less than or equal to a preset threshold, the communication node corresponding to the minimum processing result is paired with the selected communication node.

In one embodiment, when determining the OPS channel between the selected communication node and at least one other communication node to be paired among the communication nodes to be paired except the selected communication node, the method may include:

For one of the other at least one communication node to be paired, performing DFT precoding on the initial channels of the selected communication node and the corresponding communication node respectively to obtain equivalent OAM channels of the selected communication node and the corresponding communication node;

The obtained equivalent OAM channel is used to determine the corresponding OPS channel.

After step 304 is completed, the node pairing result is obtained, which can also be understood as the node pairing situation is obtained.

The communication node pairing method provided by the embodiment of the present application, the first communication node obtains the channel information of K second communication nodes; K is an integer greater than or equal to 2; according to the channel information of the K second communication nodes obtained, a second communication node that meets the preset conditions with its own position is selected from the multiple second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K; according to the allocation strategy, a mode is allocated to each communication node in the Q communication nodes to be paired; using the mode and channel information of the Q communication nodes to be paired, pairing is performed between the Q communication nodes to be paired, because the second communication node that meets the preset conditions with the position of the first communication node is selected from the multiple second communication nodes, that is, the nodes that meet the pairing conditions are selected for pairing, and it is not necessary to pair all the nodes of the system, so that when there are many system nodes, the time overhead will be greatly reduced. At the same time, the scheme of the embodiment of the present application is adopted, because the second communication node that meets the preset conditions with the position of the first communication node is selected from the multiple second communication nodes for pairing, so the pairing of multiple nodes in the same direction is achieved.

The present application is further described in detail below in conjunction with application examples.

In this application embodiment, the transmitting end is referred to as Tx, and the receiving end is referred to as Rx, which may also be referred to as a user.

Assuming that Tx is a base station and Rx is a terminal, as shown in FIG6 , the process of user pairing based on OAM includes:

Step 601: Tx obtains channel information of all Rx in the system;

Here, the system refers to a system composed of a Tx and all Rxs within its coverage area.

Tx transmits an uplink reference signal, and Tx obtains channel state information by receiving the uplink reference signal.

Tx can also use the CSI measurement reporting method in 5G NR to obtain channel information.

It should be noted that the application embodiment of the present application does not limit the process of obtaining channel information.

Step 602: Tx selects the coaxial Rx according to the obtained channel information of multiple Rx;

Specifically, methods such as Tx received signal strength and Tx received signal phase in the channel information may be used to determine whether the Rx is coaxial with the Tx antenna.

Here, in actual application, Rx whose Tx received signal strength difference and the transmitter received signal phase difference are within a certain range can be considered to be coaxial with Tx.

In this step, Tx identifies users in the same direction and forms a set of Rx to be paired.

Step 603: Tx forms a to-be-paired Rx set with the selected Rx, and their channel information forms another set, and then executes step 604;

Here, it is assumed that the Rx set to be paired is R = {R ₁ , ...R _K }; and the channel information constitutes another set H = {H ₁ , ...H _K }.

Step 604: Tx completes the allocation of modes according to the Tx set to be paired and their channel information set, and then executes step 605;

Modality allocation can adopt fixed pre-allocation method and optimal modality allocation method. Among them, pre-allocation methods include: random allocation, allocation according to the order of modalities in the set, and user priority allocation. Here, user priority allocation is to allocate a modality with a higher transmission rate to a user with a high priority according to the receiving end priority detected in advance.

The optimal mode allocation method refers to: judging whether the pre-allocated mode is the optimal mode according to the optimal strategy, and if the pre-allocated mode is the optimal mode, using the pre-allocated mode as the mode of the corresponding communication node. Among them, the optimal mode allocation is performed by a traversal method.

The optimal mode can be determined with the help of the pairing method of this application embodiment.

Specifically, Tx needs to first use the modality allocation method of allocating in set order: predetermine the modality set used by all Rx, record the system and rate at this time after step 612 is completed, and then modify the modality used by Rx, that is, re-execute step 604.

When all modal combinations are traversed, the modal allocation with the highest system and rate is the optimal modal allocation.

Step 605: After Tx allocates the mode according to the determined mode allocation method, it calculates the equivalent OAM channel according to the above formula (7), formula (8) and formula (9);

Step 606: Tx transmits a broadcast signal to inform Rx of the mode allocation result;

Here, in actual application, there is no particular order in which step 605 and step 606 are executed, that is, step 605 may be executed first and then step 606, or step 606 may be executed first and then step 605.

After completing the above operations, Tx can determine the Rx pairing status based on the mode allocation result and channel information.

Here, when the optimal modality is determined by means of the pairing method of the present application embodiment, in step 606, Tx informs Rx of the optimal modality allocation result, that is, in the process of traversing the modality combination, Tx does not inform Rx of the modality allocation result, that is, step 606 is not executed during the traversal process.

Step 607: Tx selects any Rx in the Rx set R to be paired, denoted as R _i ;

Step 608: Tx calculates K-1 OPS channels between the Rx and other Rx according to formula (10);

Step 609: Tx determines the pairing status of R _i and other Rx according to formulas (11), (12), and (14);

Here, it is determined whether formula (14) is satisfied, and only Rx that satisfies the condition can be paired.

γ _th can be set according to the actual minimum rate requirement of the system.

Tx also determines the pairing status of R _i and other Rx according to formulas (11), (13), and (15); wherein, it is determined whether formula (15) is satisfied, and only Rx that satisfies the condition can be paired.

_λth can be set according to the actual minimum rate requirement of the system.

Step 610: Tx selects two Rxs that satisfy formula (14) and have the smallest ||F ₁₂ || _F value from all pairing situations for pairing (ie, the two Rxs with the lowest correlation);

Here, when Tx also determines the pairing of R _i and other Rx according to formulas (11), (13), and (15), the two Rx satisfying formula (15) and having the smallest ||F ₂₁ || _F value are selected for pairing (ie, the two Rx with the lowest correlation).

Step 611: Delete the two Rx from the set R, output a pair of matches, and then execute step 612;

Step 612: Determine whether all Rx have completed pairing, if yes, execute step 613, otherwise, execute step 607;

Here, since the pairing needs to satisfy formula (14) or formula (15), in actual application, some Rx in the set R may not be paired. In this case, it is considered that the pairing is completed for all Tx.

Step 613: Determine whether the assigned mode is the optimal mode assignment, if yes, execute step 614, otherwise execute step 604;

Here, when it is determined that the assigned mode is not the optimal mode, then the mode used is reassigned to Rx, that is, return to step 604, and after traversing all mode combinations, output the Rx pairing situation under the optimal mode allocation. Among them, it is necessary to record the system and rate corresponding to each assigned mode (the system and rate formula can be used to determine the system and rate corresponding to each assigned mode, which is not limited in the embodiment of the present application).

Here, when the optimal mode allocation is not adopted, step 613 is not executed, and when all Rxs are paired, step 614 is directly executed;

Step 614: End the current processing flow.

It can be seen from the above description that the solution of the embodiment of the present application utilizes the characteristics of OAM mode multiplexing, overcomes the disadvantage of the related art that it is difficult to pair users in the same direction, and reduces the complexity of pairing.

In addition, the optimal mode allocation method can be adopted, so that better user pairing effect can be achieved and system performance can be improved.

In order to implement the method of the embodiment of the present application, the embodiment of the present application further provides a communication node pairing device, which is set on the first communication node. As shown in FIG. 7, the device includes:

The acquisition unit 701 is used to acquire channel information of K second communication nodes; K is an integer greater than or equal to 2;

A selection unit 702 is configured to select, according to the acquired channel information of the K second communication nodes, a second communication node whose position satisfies a preset condition with the first communication node from the K second communication nodes, to obtain Q communication nodes to be paired; Q is an integer less than K;

The allocation unit 703 is used to allocate a mode to each communication node among the Q communication nodes to be paired according to the allocation strategy;

The pairing unit 704 performs pairing between the Q communication nodes to be paired using the modes and channel information of the Q communication nodes to be paired.

In one embodiment, the allocation unit 703 is specifically configured to perform one of the following operations:

A mode is assigned to each of the Q communication nodes to be paired by random assignment;

According to the order of the modes in the set, a mode is assigned to each communication node in the Q communication nodes to be paired;

According to the order of priority of the communication nodes, a mode is assigned to each of the Q communication nodes to be paired;

A mode is pre-assigned to each of the Q communication nodes to be paired, and whether the pre-assigned mode is the optimal mode is determined according to the optimal strategy. If the pre-assigned mode is the optimal mode, the pre-assigned mode is used as the mode of the corresponding communication node.

In one embodiment, the pairing unit 704 is specifically configured to:

The method comprises: using the modalities and channel information of the Q communication nodes to be paired, when pairing between the Q communication nodes to be paired, selecting a communication node from the communication nodes to be paired, and using the modalities and channel information of the plurality of communication nodes to be paired, determining an OPS channel between the selected communication node and at least one other communication node among the communication nodes to be paired except the selected communication node; and determining a channel correlation matrix corresponding to the OPS channel;

The selected communication node is paired from the at least one other communication node to be paired using the first element in the determined channel correlation matrix; the first element is an element that can reflect the channel correlation between the selected communication node and the corresponding communication node.

In one embodiment, the pairing unit 704 is specifically used for:

For each first element of at least one first element corresponding to the at least one other communication node to be paired, take the F norm of the corresponding first element to obtain at least one processing result;

A communication node corresponding to the smallest processing result among the multiple processing results is selected as a paired communication node of the selected communication node.

In one embodiment, the pairing unit 704 is specifically used for:

In the case that the minimum processing result is less than or equal to the preset threshold, the communication node corresponding to the minimum processing result is paired with the communication node selected by the pairing unit 704.

In one embodiment, the pairing unit 704 is specifically configured to:

For one of the other at least one communication node to be paired, performing DFT precoding on the initial channels of the selected communication node and the corresponding communication node respectively to obtain equivalent OAM channels of the selected communication node and the corresponding communication node;

The obtained equivalent OAM channel is used to determine the corresponding OPS channel.

In one embodiment, the pairing unit 704 is specifically used for:

Using the selected communication node and the channel information of the corresponding communication node, respectively determine the corresponding channel matrices to obtain two channel matrices;

Using the selected communication node and the mode of the corresponding communication node, respectively determine the corresponding discrete Fourier transform DFT matrices to obtain two DFT matrices;

An equivalent OAM channel between the selected communication node and a corresponding communication node is determined using two channel matrices and two DFT matrices.

In one embodiment, the device may further include:

The notification unit is used to notify the Q communication nodes to be paired of the assigned modes.

In actual application, the acquisition unit 701 can be implemented by a processor in the communication node pairing device combined with a communication interface; the selection unit 702, the allocation unit 703, and the pairing unit 704 can be implemented by a processor in the communication node pairing device; and the notification unit can be implemented by a communication interface in the communication node pairing device.

It should be noted that: the communication node pairing device provided in the above embodiment only uses the division of the above program modules as an example when pairing communication nodes. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the communication node pairing device and the communication node pairing method embodiment provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

Based on the hardware implementation of the above program modules, and in order to implement the method of the embodiment of the present application, the embodiment of the present application further provides a communication node, as shown in FIG8 , the communication node 800 includes:

Communication interface 801, capable of exchanging information with a second communication node;

The processor 802 is connected to the communication interface 801 to implement information interaction with the second communication node, and is used to execute the method provided by one or more technical solutions when running a computer program. The computer program is stored in the memory 803.

Specifically, the processor 802 is used for:

Acquire channel information of K second communication nodes through the communication interface; K is an integer greater than or equal to 2;

According to the acquired channel information of the K second communication nodes, a second communication node whose position satisfies a preset condition with the communication node is selected from the K second communication nodes to obtain Q communication nodes to be paired; Q is an integer less than K;

According to the allocation strategy, a mode is allocated to each of the Q communication nodes to be paired;

Pairing is performed between the Q communication nodes to be paired using the mode and channel information of the Q communication nodes to be paired.

In one embodiment, the processor 802 is specifically configured to perform one of the following operations:

A mode is assigned to each of the Q communication nodes to be paired by random assignment;

According to the order of the modes in the set, a mode is assigned to each communication node in the Q communication nodes to be paired;

According to the order of priority of the communication nodes, a mode is assigned to each of the Q communication nodes to be paired;

A mode is pre-assigned to each of the Q communication nodes to be paired, and whether the pre-assigned mode is the optimal mode is determined according to the optimal strategy. If the pre-assigned mode is the optimal mode, the pre-assigned mode is used as the mode of the corresponding communication node.

In one embodiment, the processor 802 is specifically configured to:

The method comprises: using the modalities and channel information of the Q communication nodes to be paired, when pairing between the Q communication nodes to be paired, selecting a communication node from the communication nodes to be paired, and using the modalities and channel information of the multiple communication nodes to be paired, determining an OPS channel between the selected communication node and at least one other communication node among the multiple communication nodes to be paired except the selected communication node; and determining a channel correlation matrix corresponding to the OPS channel;

The selected communication node is paired from the at least one other communication node to be paired using the first element in the determined channel correlation matrix; the first element is an element that can reflect the channel correlation between the selected communication node and the corresponding communication node.

In one embodiment, the processor 802 is specifically configured to:

For each first element of at least one first element corresponding to the at least one other communication node to be paired, taking an F norm for the corresponding first element to obtain multiple processing results;

A communication node corresponding to the smallest processing result among the multiple processing results is selected as a paired communication node of the selected communication node.

In one embodiment, the processor 802 is specifically configured to:

In a case where the minimum processing result is less than or equal to a preset threshold, the communication node corresponding to the minimum processing result is paired with the selected communication node.

In one embodiment, the processor 802 is specifically configured to:

For one of the other at least one communication node to be paired, performing DFT precoding on the initial channels of the selected communication node and the corresponding communication node respectively to obtain equivalent OAM channels of the selected communication node and the corresponding communication node;

The obtained equivalent OAM channel is used to determine the corresponding OPS channel.

In one embodiment, the processor 802 is specifically configured to:

Using the selected communication node and the channel information of the corresponding communication node, respectively determine the corresponding channel matrices to obtain two channel matrices;

Using the selected communication node and the mode of the corresponding communication node, respectively determine the corresponding discrete Fourier transform DFT matrices to obtain two DFT matrices;

An equivalent OAM channel between the selected communication node and a corresponding communication node is determined using two channel matrices and two DFT matrices.

In one embodiment, the communication interface 801 is used to notify the Q communication nodes to be paired of the assigned modes.

It should be noted that the specific processing process of the processor 802 and the communication interface 801 can be understood by referring to the above method.

Of course, in actual application, the various components in the communication node 800 are coupled together through the bus system 804. It can be understood that the bus system 804 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 804 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, various buses are marked as the bus system 804 in FIG. 8.

The memory 803 in the embodiment of the present application is used to store various types of data to support the operation of the communication node 800. Examples of such data include: any computer program used to operate on the communication node 800.

The method disclosed in the above embodiment of the present application can be applied to the processor 802, or implemented by the processor 802. The processor 802 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor 802 or an instruction in the form of software. The above-mentioned processor 802 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 802 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in the memory 803, and the processor 802 reads the information in the memory 803 and completes the steps of the above method in combination with its hardware.

In an exemplary embodiment, the communication node 800 may be implemented by one or more application specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to execute the aforementioned method.

It can be understood that the memory 803 of the embodiment of the present application can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a ferromagnetic random access memory, a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), direct memory bus random access memory (DRRAM). The memory described in the embodiments of the present application is intended to include but is not limited to these and any other suitable types of memory.

In an exemplary embodiment, the embodiment of the present application further provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, for example, including a memory 803 storing a computer program, and the computer program can be executed by a processor 802 of a communication node 800 to complete the steps of the aforementioned method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface storage, optical disk, or CD-ROM.

It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims (11)

1. A method of pairing communication nodes, applied to a first communication node, comprising:

obtaining channel information of K second communication nodes; k is an integer greater than or equal to 2;

selecting a second communication node which meets a preset condition with the position of the second communication node from K second communication nodes according to the acquired channel information of the N second communication nodes, and obtaining Q communication nodes to be paired; q is an integer less than K;

According to the allocation strategy, allocating a mode for each communication node in the Q communication nodes to be paired;

Pairing is carried out among the Q communication nodes to be paired by utilizing the modality and channel information of the Q communication nodes to be paired;

the method comprises the following steps of when the Q communication nodes to be paired are paired by using the mode and channel information of the Q communication nodes to be paired, wherein the method comprises the following steps:

selecting one communication node from the communication nodes to be paired, and determining an orthogonal pairing algorithm OPS channel between the selected communication node and at least one other communication node except the selected communication node in the communication nodes to be paired by using the mode and channel information of the communication nodes to be paired; determining a channel correlation matrix corresponding to the OPS channel;

Pairing the selected communication node from the other at least one communication node to be paired by using a first element in the determined channel correlation matrix; the first element is an element capable of embodying a channel correlation between the selected communication node and a corresponding communication node.

2. The method of claim 1, wherein pairing the selected communication node from the other at least one communication node to be paired using the first element in the determined channel correlation matrix comprises:

taking F norms of the corresponding first elements aiming at each first element in at least one first element corresponding to the other at least one communication node to be paired to obtain at least one processing result;

And selecting a communication node corresponding to the smallest processing result in at least one processing result as a pairing communication node of the selected communication nodes.

3. The method according to claim 2, wherein in case the smallest processing result is smaller than or equal to a preset threshold, the communication node corresponding to the smallest processing result is paired with the communication node as the selected communication node.

4. The method according to claim 1, wherein when determining an OPS channel between the selected communication node and at least one other communication node to be paired among the communication nodes to be paired other than the selected communication node, the method comprises:

For one communication node in the other at least one communication node to be paired, performing discrete Fourier transform DFT precoding on initial channels of the selected communication node and the corresponding communication node respectively to obtain equivalent Orbital Angular Momentum (OAM) channels of the selected communication node and the corresponding communication node;

and determining a corresponding OPS channel by using the obtained equivalent OAM channel.

5. The method according to claim 4, wherein performing DFT precoding on the initial channels of the selected communication node and the corresponding communication node, respectively, to obtain equivalent OAM channels of the selected communication node and the corresponding communication node, comprises:

respectively determining corresponding channel matrixes by using the selected communication nodes and the channel information of the corresponding communication nodes to obtain two channel matrixes;

determining corresponding discrete Fourier transform DFT matrixes respectively by using the selected communication nodes and the modes of the corresponding communication nodes to obtain two DFT matrixes;

And determining an equivalent OAM channel between the selected communication node and the corresponding communication node by using the two channel matrixes and the two DFT matrixes.

6. The method according to any of claims 1 to 5, wherein the assigning a modality to each of the Q communication nodes to be paired according to an assignment policy comprises one of:

adopting a random distribution mode to distribute modes for each communication node in the Q communication nodes to be paired;

according to the sequence of the modes in the set, allocating the modes for each communication node in the Q communication nodes to be paired;

According to the order of the priority of the communication nodes, allocating a mode for each communication node in the Q communication nodes to be paired;

and pre-distributing a mode for each communication node in the Q communication nodes to be paired, judging whether the pre-distributed mode is an optimal mode according to an optimal strategy, and taking the pre-distributed mode as the mode of the corresponding communication node under the condition that the pre-distributed mode is the optimal mode.

7. The method according to any one of claims 1 to 5, further comprising:

and informing the Q modes allocated by the communication nodes to be paired.

8. A communication node pairing apparatus, comprising:

An obtaining unit, configured to obtain channel information of K second communication nodes; n is an integer greater than or equal to 2;

A selecting unit, configured to select, according to the acquired channel information of the K second communication nodes, a second communication node that satisfies a preset condition with the first communication node from the K second communication nodes, so as to obtain Q communication nodes to be paired; q is an integer less than K;

The distribution unit is used for distributing modes to each communication node in the Q communication nodes to be paired according to the distribution strategy;

pairing unit, utilizing the mode and channel information of Q communication nodes to be paired to pair between Q communication nodes to be paired;

The pairing unit is specifically configured to select one communication node from the communication nodes to be paired, and determine an orthogonal pairing algorithm OPS channel between the selected communication node and at least one other communication node except the selected communication node in the communication nodes to be paired by using the mode and channel information of the communication node to be paired; determining a channel correlation matrix corresponding to the OPS channel; pairing the selected communication node from the other at least one communication node to be paired by using a first element in the determined channel correlation matrix; the first element is an element capable of embodying a channel correlation between the selected communication node and a corresponding communication node.

9. A communication node, comprising: a processor and a communication interface; wherein the processor is configured to:

obtaining channel information of K second communication nodes through the communication interface; n is an integer greater than or equal to 2;

selecting a second communication node which meets a preset condition with the position of the communication node from the K second communication nodes according to the acquired channel information of the K second communication nodes, and obtaining Q communication nodes to be paired; q is an integer less than K;

According to the allocation strategy, allocating a mode for each communication node in the Q communication nodes to be paired;

Pairing is carried out among the Q communication nodes to be paired by utilizing the modality and channel information of the Q communication nodes to be paired;

the processor is specifically configured to select one communication node from the communication nodes to be paired, and determine an orthogonal pairing algorithm OPS channel between the selected communication node and at least one other communication node except the selected communication node in the communication nodes to be paired by using the mode and channel information of the communication node to be paired; determining a channel correlation matrix corresponding to the OPS channel; pairing the selected communication node from the other at least one communication node to be paired by using a first element in the determined channel correlation matrix; the first element is an element capable of embodying a channel correlation between the selected communication node and a corresponding communication node.

10. A communication node, comprising: a processor and a memory for storing a computer program capable of running on the processor,

Wherein the processor is adapted to perform the steps of the method of any of claims 1 to 7 when the computer program is run.

11. A storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method according to any of claims 1 to 7.