CN105407536A - Method and device for determining access frequency band based on D2D communication - Google Patents

Abstract

The embodiment of the present invention discloses a method and device for determining an access frequency band based on D2D communication, which relates to the field of communication technology and can solve the problem of communication interference between D2D users and cellular users, while maximizing the communication rate of D2D users. The method in the embodiment of the present invention includes: determining the low-interference user set according to the obtained first to fourth distances; obtaining the uplink of the target cellular terminal multiplexed by the D2D transmitter and the D2D receiver during the D2D communication process according to the obtained fading parameters The ergodic rate in the frequency band; determine the uplink frequency band of the target cellular terminal corresponding to the maximum value in the ergodic rate as the access frequency band; determine the D2D transmitter by comparing the transmit power, maximum transmit power, and minimum transmit power of the D2D transmitter optimal transmit power. The invention is applicable to a communication network.

Description

A method and device for determining an access frequency band based on D2D communication

technical field

The present invention relates to the field of communication technology, in particular to a method and device for determining an access frequency band based on D2D communication.

Background technique

With the development of communication technologies, especially the popularization of cellular networks, in order to effectively improve the spectrum utilization rate of cells, D2D (Device To Device, Direct Device Access) users are gradually introduced in cells. During the communication process, D2D users can directly transmit user data without going through the network, that is, user data can be directly transmitted between terminal A and terminal B that belong to the D2D user. Moreover, when communicating between D2D users, the uplink frequency band of the cellular users is used for data transmission.

At present, in order to reduce communication interference between D2D users and cellular users during communication, resource allocation is usually performed through interference pricing, user games, scheduling algorithms, and the like. However, using the above method to allocate resources of the cellular network can only reduce the probability of interference to a certain extent, and there is still a problem of communication interference between D2D users and cellular users.

Contents of the invention

Embodiments of the present invention provide a method and device for determining an access frequency band based on D2D communication, which can solve the problem of communication interference between D2D users and cellular users.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In the first aspect, an embodiment of the present invention provides a method for determining an access frequency band based on D2D communication, and the method is applicable to a communication network in which basic terminals, direct device access D2D terminals, and base stations are set. The D2D terminal includes a D2D transmitter and a D2D receiver, and D2D communication is communication between the D2D transmitter and the D2D receiver, and the method includes:

Acquire a distance parameter, the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is the distance from the basic terminal to the base station, and the second distance is the the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station;

determining a low-interference user set according to the first to fourth distances, the low-interference user set including target terminals that meet the communication access conditions between the D2D transmitter and the D2D receiver;

Obtaining a fading parameter, where the fading parameter is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment;

According to the interference temperature threshold, acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication;

Determine the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate as the access frequency band.

In the second aspect, an embodiment of the present invention provides a device for determining an access frequency band based on D2D communication. The device is applicable to a communication network in which a basic terminal, a direct device access D2D terminal, and a base station are set. The D2D terminal includes a D2D transmitter and a D2D receiver, and D2D communication is communication between the D2D transmitter and the D2D receiver, and the device includes:

An acquisition module, configured to acquire distance parameters, where the distance parameters include a first distance, a second distance, a third distance, and a fourth distance, the first distance being the distance from the basic terminal to the base station, and the second distance The second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the D2D receiver. the distance from the base station;

A determining module, configured to determine a low-interference user set according to the first to fourth distances, the low-interference user set including target terminals that meet the communication access conditions between the D2D transmitter and the D2D receiver;

The obtaining module is also used to obtain a fading parameter, where the fading parameter is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment;

The acquiring module is further configured to acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process according to the interference temperature threshold;

The determining module is further configured to determine that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band.

According to the method and device for determining the access frequency band based on D2D communication provided by the embodiments of the present invention, the low-interference user set is determined according to the acquired first to fourth distances, and then the low-interference user set is determined according to the acquired fading parameters Each target terminal in the D2D communication process obtains the ergodic rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal, and determines the uplink frequency band of the target terminal corresponding to the maximum value of the ergodic rate as the access frequency band . Among them, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station Distance, the low-interference user set includes the target terminal that meets the communication access conditions of the D2D transmitter and the D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver; the fading parameter is the target terminal and the base station in a fading environment Interference temperature threshold for normal communication. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , base station, and D2D user to determine the target terminal, and then determine the uplink frequency band of the target terminal corresponding to the maximum ergodic rate according to the maximum value of the ergodic rate obtained for the target terminal as the access frequency band. Therefore, the problem of communication interference between D2D users and cellular users is solved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic diagram of a specific application scenario provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a method for determining an access frequency band based on D2D communication according to an embodiment of the present invention;

FIG. 3 is a flow chart of another method for determining an access frequency band based on D2D communication according to an embodiment of the present invention;

FIG. 4 is a flow chart of another method for determining an access frequency band based on D2D communication according to an embodiment of the present invention;

FIG. 5 is a flowchart of another method for determining an access frequency band based on D2D communication according to an embodiment of the present invention;

FIG. 6 is a flowchart of another method for determining an access frequency band based on D2D communication according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another device for determining an access frequency band based on D2D communication according to an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention can be used in a communication network, and a basic terminal, a D2D terminal and a base station can be set in the communication network. Wherein, the D2D terminal includes a D2D transmitter and a D2D receiver, and communication between the D2D transmitter and the D2D receiver may be collectively referred to as D2D communication. In the communication network shown in Fig. 1, multiple cellular users, base stations, DUE _TX and DUE _RX are set. Among them, DUE _TX is used to represent a D2D transmitter, DUE _RX is used to represent a D2D receiver, and a cellular user is used to represent a basic terminal. In the embodiment of the present invention, the distance from cellular user i to the base station can be used Indicates that the distance from cellular user i to DUE _RX can be used Indicates that the distance from DUE _TX to DUE _RX can be used Indicates that the distance from DUE _TX to the base station can be used express. In the embodiment of the present invention, consider that N cellular users in the network respectively occupy N orthogonal OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) subcarriers in the cell, and the bandwidth is w, then the cell is fully loaded , that is, cellular users have already occupied all the uplink frequency bands of the base station, and there are no idle resources. That is to say, if D2D users want to complete data transmission, they can only share the uplink frequency band with cellular users without causing intolerable interference to cellular data transmission.

Therefore, an embodiment of the present invention provides a method for determining an access frequency band based on D2D communication, which is used for determining the access frequency band. As shown in Figure 2, the method is performed by a network device or a server, and the method includes:

101. Acquire a distance parameter.

Wherein, the distance parameter includes a first distance, a second distance, a third distance and a fourth distance, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, and the third distance is the distance from the D2D The distance from the transmitter to the D2D receiver, the fourth distance is the distance from the D2D transmitter to the base station.

As shown in Figure 1, the first distance corresponding to cellular user i can be The second distance corresponding to cellular user i can be The third distance corresponding to cellular user i can be The fourth distance corresponding to cellular user i can be

102. Determine a low-interference user set according to the first to fourth distances.

Wherein, the low-interference user set includes target terminals that meet the communication access conditions of the D2D transmitter and the D2D receiver.

In the embodiment of the present invention, the basic terminals may be specifically divided into two types, namely basic terminals belonging to a low-interference user set and basic terminals belonging to a high-interference user set. According to the first to fourth distances obtained in step 101, the basic terminal can be divided into different user sets, and the specific division method will be proposed later, and will not be repeated here.

103. Acquire fading parameters.

Wherein, the fading parameter is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment.

104. Acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process according to the interference temperature threshold.

105. Determine that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band.

According to each ergodic rate determined in step 104, determine the maximum ergodic rate from each ergodic rate, that is, the ergodic rate with the largest numerical value among the determined ergodic rates, and then determine the uplink frequency band of the target terminal corresponding to the maximum ergodic rate as the next The access frequency band is used to realize communication between D2D users, that is, the D2D transmitter sends data to the D2D receiver in the access frequency band.

According to the method for determining the access frequency band based on D2D communication provided by the embodiment of the present invention, the low-interference user set is determined according to the acquired first to fourth distances, and then the low-interference user set is determined according to the acquired fading parameters. Each target terminal obtains the ergodic rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process, and determines the uplink frequency band of the target terminal corresponding to the maximum value of the ergodic rate as the access frequency band. Among them, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station Distance, the low-interference user set includes the target terminal that meets the communication access conditions of the D2D transmitter and the D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver; the fading parameter is the target terminal and the base station in a fading environment Interference temperature threshold for normal communication. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , base station, and D2D user to determine the target terminal, and then determine the uplink frequency band of the target terminal corresponding to the maximum ergodic rate according to the maximum value of the ergodic rate obtained for the target terminal as the access frequency band. Therefore, the problem of communication interference between D2D users and cellular users is solved.

In order to more accurately screen out the basic terminals belonging to the low-interference user set, in an implementation of the embodiment of the present invention, it may be determined by the obtained first SIR threshold, second SIR threshold, path loss factor, and formula Target terminals that meet the constraints in the formula, and determine the target terminals as belonging to the low-interference user set. Therefore, on the basis of the implementation shown in FIG. 2 , it can also be implemented as the implementation shown in FIG. 3 . Wherein, before step 102 is performed to determine the low-interference user set according to the first to fourth distances, step 106 may also be performed, and step 102 may be specifically implemented as step 1021:

106. Acquire the first SIR threshold, the second SIR threshold, and the path loss factor.

Wherein, the first SIR (Signal to Interference Ratio, signal to interference ratio) threshold is the lowest SIR threshold in the D2D communication process, and the second SIR threshold is the lowest SIR threshold in the communication between the basic terminal and the base station.

In the embodiment of the present invention, the first SIR threshold is the lowest SIR threshold that can ensure the normal communication between the D2D transmitter and the D2D receiver during the process of the D2D transmitter sending data to the D2D receiver; the second SIR threshold is the In the process of sending data to the base station, the minimum SIR threshold that can ensure the normal communication between the basic terminal and the base station. It should be noted that, the specific setting manners of the first SIR threshold and the second SIR threshold are not limited in this embodiment of the present invention, and can be preset by staff according to experience values.

1021. Determine to satisfy the inequality The target terminal belongs to the low-interference user set.

Among them, δ _D is the first SIR threshold, δ _C is the second SIR threshold, α is the path loss factor, d _C2C is the first distance, d _C2D is the second distance, d _D2D is the third distance, d _D2C is the fourth distance distance.

It should be noted that the path loss factor may be obtained directly from the network side, or calculated according to parameters that affect the path loss. In the embodiment of the present invention, the specific acquisition method of the path loss factor is not specifically limited.

The embodiment of the present invention provides a method for determining the access frequency band based on D2D communication. According to the obtained first to fourth distances, it is determined that the target terminal satisfying the inequality belongs to the low-interference user set, and then according to the obtained fading parameters, for Each target terminal in the low-interference user set obtains the ergodic rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process, and determines the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate for the access frequency band. Among them, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station Distance, the low-interference user set includes the target terminal that meets the communication access conditions of the D2D transmitter and the D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver; the fading parameter is the target terminal and the base station in a fading environment Interference temperature threshold for normal communication. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , the base station, and the geographic location relationship between D2D users to accurately determine the target terminal belonging to the low-interference user set, and then determine the uplink of the target terminal corresponding to the maximum ergodic rate according to the maximum value of the ergodic rate obtained for the target terminal The frequency band is the access frequency band. Therefore, the problem of communication interference between D2D users and cellular users is solved.

In order to determine the ergodic rate more accurately, in an implementation manner of the embodiment of the present invention, calculation may be performed according to a formula to determine the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal. Therefore, on the basis of the implementation shown in FIG. 3 , it can also be implemented as the implementation shown in FIG. 4 . Wherein, step 104 obtains the traversal rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process according to the interference temperature threshold, which can be specifically implemented as step 1041:

1041. According to the formula Calculate the traversal rate.

in, is the traversal rate of the i-th target terminal, i is a positive integer greater than 0, w is the bandwidth of the frequency band occupied in the D2D communication process, γ _i is a function of Q _i , and satisfies the equation Among them, Q _i is the interference temperature threshold for normal communication between the i-th target terminal and the base station in a fading environment, and N ₀ B is Gaussian white noise. It should be noted that N ₀ is a power spectral density, B is a bandwidth, and both N ₀ and B can be obtained directly from the network side.

The embodiment of the present invention provides a method for determining the access frequency band based on D2D communication. According to the obtained first to fourth distances, it is determined that the target terminal satisfying the inequality belongs to the low-interference user set, and then according to the obtained fading parameters, according to The formula is calculated to obtain the ergodic rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process for each target terminal in the low-interference user set, and determine the corresponding maximum value of the ergodic rate The uplink frequency band of the target terminal is the access frequency band. Among them, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station Distance, the low-interference user set includes the target terminal that meets the communication access conditions of the D2D transmitter and the D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver; the fading parameter is the target terminal and the base station in a fading environment Interference temperature threshold for normal communication. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , the base station, and the geographic location relationship between D2D users to accurately determine the target terminal belonging to the low-interference user set, and then calculate according to the formula to obtain the accurate maximum value of the traversal rate obtained for the target terminal, so as to accurately determine the traversal rate The uplink frequency band of the target terminal corresponding to the maximum value is the access frequency band. Therefore, the problem of communication interference between D2D users and cellular users is solved.

In order to ensure that the transmission power of the D2D transmitter affects the communication of the basic terminal as little as possible, in an implementation of the embodiment of the present invention, the transmission power of the D2D transmitter and the maximum transmission power of the D2D transmitter can be calculated according to the formula , and the minimum transmit power of the D2D transmitter, and determine the optimal transmit power of the D2D transmitter. Therefore, on the basis of the implementation shown in FIG. 4 , the implementation shown in FIG. 5 can also be implemented. Wherein, after performing step 105 to determine that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band, steps 107 to 110 may also be performed:

107. According to the formula Perform calculation to obtain the transmit power of the D2D transmitter.

Among them, γ ₀ is the γ _i corresponding to the maximum value in the ergodic rate, is the transmission power of the D2D transmitter.

108. According to the formula Perform calculations to obtain the maximum transmission power of the D2D transmitter.

Wherein, P _C is the transmit power of the target terminal corresponding to the maximum value in the ergodic rate, and _PDmax is the maximum transmit power of the D2D transmitter.

109. According to the formula Perform calculations to obtain the minimum transmit power of the D2D transmitter.

Among them, P _Dnin is the minimum transmission power of the D2D transmitter.

110. Determine an optimal transmit power of the D2D transmitter according to the transmit power of the D2D transmitter, the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter.

It should be noted that, since there is no time sequence limitation during the execution of steps 107 to 109, steps 107 to 109 may be executed at the same time or in a certain sequence.

The embodiment of the present invention provides a method for determining the access frequency band based on D2D communication. After the access frequency band is determined, the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the D2D transmission The minimum transmit power of the D2D transmitter, and then determine the optimal transmit power of the D2D transmitter according to the above calculated parameters. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , the base station, and the geographic location relationship between D2D users to accurately determine the target terminal belonging to the low-interference user set, and then calculate according to the formula to obtain the accurate maximum value of the traversal rate obtained for the target terminal, so as to accurately determine the traversal rate The uplink frequency band of the target terminal corresponding to the maximum value is the access frequency band. And after the access frequency band is determined, the optimal transmission power of the D2D transmitter is obtained through formula calculation. Therefore, while solving the problem of communication interference between D2D users and cellular users, the rate between D2D users is maximized.

In order to accurately determine the optimal transmit power of the D2D transmitter, in an implementation manner of the embodiment of the present invention, the difference between the transmit power of the D2D transmitter and the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter can be The relationship between the size of the D2D transmitter to finally determine the transmission power of the D2D transmitter that best meets the current communication environment. Therefore, on the basis of the implementation shown in FIG. 5 , the implementation shown in FIG. 6 may also be implemented. Wherein, step 110 determines the optimal transmission power of the D2D transmitter according to the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter, which can be specifically implemented as steps 1101 and 1102:

1101. when when, confirm is the optimal transmit power of the D2D transmitter.

1102. when or When , determine P _Dmax as the optimal transmission power of the D2D transmitter.

In the embodiment of the present invention, the transmit power of the D2D transmitter can be determined according to the transmit power of the D2D transmitter calculated in steps 106 to 108, the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter The relationship between the maximum transmission power of the D2D transmitter and the minimum transmission power of the D2D transmitter, so as to determine the optimal transmission power of the D2D transmitter. That is, according to the formula The value of the optimal transmission power of the D2D transmitter can be determined. in, is the optimal transmit power of the D2D transmitter.

The embodiment of the present invention provides a method for determining the access frequency band based on D2D communication. After the access frequency band is determined, the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the D2D transmission The minimum transmit power of the D2D transmitter is determined, and then the optimal transmit power of the D2D transmitter is determined according to the magnitude relationship between the above-mentioned calculated parameters. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , the base station, and the geographic location relationship between D2D users to accurately determine the target terminal belonging to the low-interference user set, and then calculate according to the formula to obtain the accurate maximum value of the traversal rate obtained for the target terminal, so as to accurately determine the traversal rate The uplink frequency band of the target terminal corresponding to the maximum value is the access frequency band. And after the access frequency band is determined, the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter are obtained through formula calculation, and then the D2D transmission is determined according to the relationship between the above parameters. The optimal transmission power of the machine. Therefore, while solving the problem of communication interference between D2D users and cellular users, the rate between D2D users is maximized.

The embodiment of the present invention provides a device 20 for determining the access frequency band based on D2D communication. The device 20 is applicable to a communication network in which there are basic terminals, direct equipment access to D2D terminals and base stations, and D2D terminals include D2D transmission machine and D2D receiver, D2D communication is the communication between D2D transmitter and D2D receiver, as shown in Figure 7, the device 20 includes:

An acquisition module 21, configured to acquire a distance parameter, the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is the distance from the base terminal to the base station, and the second distance is the distance from the base terminal to the D2D receiver The third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station.

The determining module 22 is configured to determine a low-interference user set according to the first to fourth distances, and the low-interference user set includes target terminals that meet the communication access conditions of the D2D transmitter and the D2D receiver.

The obtaining module 21 is also used to obtain a fading parameter, which is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment.

The acquiring module 21 is further configured to acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process according to the interference temperature threshold.

The determination module 22 is further configured to determine that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band.

In an implementation of the embodiment of the present invention, the obtaining module 21 is also used to obtain the first signal-to-interference ratio SIR threshold, the second SIR threshold and the path loss factor, the first SIR threshold is the lowest SIR threshold in the D2D communication process, The second SIR threshold is the lowest SIR threshold for communication between the basic terminal and the base station.

Determining module 22, specifically for determining to satisfy the inequality The target terminal belongs to the low-interference user set, where δ _D is the first SIR threshold, δ _C is the second SIR threshold, α is the path loss factor, d _C2C is the first distance, d _C2D is the second distance, d _D2D is the third distance, and d _D2C is the fourth distance.

In an implementation of the embodiment of the present invention, the obtaining module 21 is specifically configured to Calculate the traversal rate, where, is the traversal rate of the i-th target terminal, i is a positive integer greater than 0, w is the bandwidth of the frequency band occupied in the D2D communication process, γ _i is a function of Q _i , and satisfies the equation Among them, Q _i is the interference temperature threshold for normal communication between the i-th target terminal and the base station in a fading environment, and N ₀ B is Gaussian white noise.

In an implementation of the embodiment of the present invention, the calculation module 23 is used to calculate according to the formula Perform calculations to obtain the transmit power of the D2D transmitter, where γ ₀ is the γ _i corresponding to the maximum value in the ergodic rate, is the transmission power of the D2D transmitter.

The calculation module 23 is also used to calculate according to the formula Perform calculations to obtain the maximum transmission power of the D2D transmitter, wherein P _C is the transmission power of the target terminal corresponding to the maximum value in the ergodic rate, and P _Dmax is the maximum transmission power of the D2D transmitter.

The calculation module 23 is also used to calculate according to the formula The minimum transmission power of the D2D transmitter is obtained through calculation, wherein P _Dnin is the minimum transmission power of the D2D transmitter.

The determination module 22 is further configured to determine the optimal transmission power of the D2D transmitter according to the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter.

In an implementation of the embodiment of the present invention, the determination module 22 is specifically used for when, confirm is the optimal transmission power of the D2D transmitter;

when or When , determine P _Dmax as the optimal transmission power of the D2D transmitter.

An apparatus for determining an access frequency band based on D2D communication provided by an embodiment of the present invention determines a low-interference user set according to the obtained first to fourth distances, and then according to the obtained fading parameters, targets the low-interference user set in the low-interference user set Each target terminal obtains the ergodic rate when the D2D transmitter and D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process, and determines the uplink frequency band of the target terminal corresponding to the maximum value of the ergodic rate as the access frequency band. Among them, the first distance is the distance from the basic terminal to the base station, the second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station Distance, the low-interference user set includes the target terminal that meets the communication access conditions of the D2D transmitter and the D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver; the fading parameter is the target terminal and the base station in a fading environment Interference temperature threshold for normal communication. Compared with resource allocation in the prior art through interference pricing, user games, scheduling algorithms, etc., the present invention can be based on the geographical location relationship between the terminal, the base station, the D2D transmitter and the D2D receiver, that is, according to the cellular user , base station, and D2D user to determine the target terminal, and then determine the uplink frequency band of the target terminal corresponding to the maximum ergodic rate according to the maximum value of the ergodic rate obtained for the target terminal as the access frequency band. Therefore, the problem of communication interference between D2D users and cellular users is solved.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiments.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A method for determining an access frequency band based on D2D communication, wherein the method is applicable to a communication network in which basic terminals, direct device access D2D terminals and base stations are set, and the D2D The terminal includes a D2D transmitter and a D2D receiver, and D2D communication is communication between the D2D transmitter and the D2D receiver, and the method includes: Acquire a distance parameter, the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is the distance from the basic terminal to the base station, and the second distance is the the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the base station; determining a low-interference user set according to the first to fourth distances, the low-interference user set including target terminals that meet the communication access conditions between the D2D transmitter and the D2D receiver; Obtaining a fading parameter, where the fading parameter is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment; According to the interference temperature threshold, acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication; Determine the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate as the access frequency band. 2. The method according to claim 1, characterized in that before said determining the low-interference user set according to the first to fourth distances, comprising: Obtain a first signal-to-interference ratio SIR threshold, a second SIR threshold and a path loss factor, the first SIR threshold is the lowest SIR threshold in the D2D communication process, and the second SIR threshold is the minimum SIR threshold between the basic terminal and the Minimum SIR threshold for communication between base stations; The determining the low-interference user set according to the first to fourth distances includes: Make sure to satisfy the inequality The target terminal belongs to the low-interference user set, where δ _D is the first SIR threshold, δ _C is the second SIR threshold, α is the path loss factor, and d _C2C is the first distance , d _C2D is the second distance, d _D2D is the third distance, and d _D2C is the fourth distance. 3. The method according to claim 2, wherein, according to the interference temperature threshold, during the D2D communication process, the D2D transmitter and the D2D receiver multiplex the information of the target terminal The traversal rate of the uplink frequency band, including: According to the formula Perform calculations to obtain the ergodic rate, where, is the traversal rate of the i-th target terminal, i is a positive integer greater than 0, w is the bandwidth of the frequency band occupied in the D2D communication process, γ _i is a function of Q _i , and satisfies the equation Wherein, Q _i is the interference temperature threshold for normal communication between the ith target terminal and the base station in a fading environment, and N ₀ B is Gaussian white noise. 4. The method according to claim 3, characterized in that, after determining that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band, comprising: According to the formula performing calculations to obtain the transmit power of the D2D transmitter, where γ ₀ is γ _i corresponding to the maximum value in the ergodic rate, is the transmission power of the D2D transmitter; According to the formula Performing calculations to obtain the maximum transmission power of the D2D transmitter, wherein P _C is the transmission power of the target terminal corresponding to the maximum value in the ergodic rate, and P _Dmax is the maximum transmission power of the D2D transmitter; According to the formula Performing calculations to obtain the minimum transmit power of the D2D transmitter, where P _Dnin is the minimum transmit power of the D2D transmitter; Determine the optimal transmit power of the D2D transmitter according to the transmit power of the D2D transmitter, the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter. 5. The method according to claim 4, characterized in that, according to the transmit power of the D2D transmitter, the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter, the The optimal transmission power of the D2D transmitter includes: when when, confirm is the optimal transmit power of the D2D transmitter; when or , determine P _Dmax as the optimal transmission power of the D2D transmitter. 6. A device for determining an access frequency band based on D2D communication, characterized in that the device is applicable to a communication network, and the communication network is provided with basic terminals, direct device access D2D terminals and base stations, and the D2D The terminal includes a D2D transmitter and a D2D receiver, and D2D communication is communication between the D2D transmitter and the D2D receiver, and the device includes: An acquisition module, configured to acquire distance parameters, where the distance parameters include a first distance, a second distance, a third distance, and a fourth distance, the first distance being the distance from the basic terminal to the base station, and the second distance The second distance is the distance from the basic terminal to the D2D receiver, the third distance is the distance from the D2D transmitter to the D2D receiver, and the fourth distance is the distance from the D2D transmitter to the D2D receiver. the distance from the base station; A determining module, configured to determine a low-interference user set according to the first to fourth distances, the low-interference user set including target terminals that meet the communication access conditions between the D2D transmitter and the D2D receiver; The obtaining module is also used to obtain a fading parameter, where the fading parameter is an interference temperature threshold for normal communication between the target terminal and the base station in a fading environment; The acquiring module is further configured to acquire the ergodic rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal during the D2D communication process according to the interference temperature threshold; The determining module is further configured to determine that the uplink frequency band of the target terminal corresponding to the maximum value in the ergodic rate is the access frequency band. 7. The device according to claim 6, wherein the acquiring module is further configured to acquire a first signal-to-interference ratio (SIR) threshold, a second SIR threshold and a path loss factor, and the first SIR threshold is the The lowest SIR threshold in the D2D communication process, the second SIR threshold is the lowest SIR threshold for communication between the basic terminal and the base station; The determination module is specifically used to determine that the inequality is satisfied The target terminal belongs to the low-interference user set, where δ _D is the first SIR threshold, δ _C is the second SIR threshold, α is the path loss factor, and d _C2C is the first distance , d _C2D is the second distance, d _D2D is the third distance, and d _D2C is the fourth distance. 8. The device according to claim 7, wherein the acquisition module is specifically configured to Perform calculations to obtain the ergodic rate, where, is the traversal rate of the i-th target terminal, i is a positive integer greater than 0, w is the bandwidth of the frequency band occupied in the D2D communication process, γ _i is a function of Q _i , and satisfies the equation Wherein, Q _i is the interference temperature threshold for normal communication between the ith target terminal and the base station in a fading environment, and N ₀ B is Gaussian white noise. 9. The device according to claim 8, characterized in that the calculation module is used to calculate according to the formula performing calculations to obtain the transmit power of the D2D transmitter, where γ ₀ is γ _i corresponding to the maximum value in the ergodic rate, is the transmission power of the D2D transmitter; The calculation module is also used to calculate according to the formula Performing calculations to obtain the maximum transmission power of the D2D transmitter, wherein P _C is the transmission power of the target terminal corresponding to the maximum value in the ergodic rate, and P _Dmax is the maximum transmission power of the D2D transmitter; The calculation module is also used to calculate according to the formula Performing calculations to obtain the minimum transmit power of the D2D transmitter, where P _Dnin is the minimum transmit power of the D2D transmitter; The determination module is further configured to determine the optimal transmission power of the D2D transmitter according to the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter . 10. The device according to claim 9, wherein the determining module is specifically used for when when, confirm is the optimal transmit power of the D2D transmitter; when or , determine P _Dmax as the optimal transmission power of the D2D transmitter.