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

Method and device for determining access frequency band based on D2D communication Download PDF

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Publication number
CN105407536A
CN105407536A CN201510903447.4A CN201510903447A CN105407536A CN 105407536 A CN105407536 A CN 105407536A CN 201510903447 A CN201510903447 A CN 201510903447A CN 105407536 A CN105407536 A CN 105407536A
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transmitter
distance
communication
frequency band
transmit power
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CN105407536B (en
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张雨驰
聂昌
胡云
裴郁杉
孙云翔
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a method and a device for determining an access frequency band based on D2D communication, relates to the technical field of communication, and can solve the problem that communication interference occurs between a D2D user and a cellular user and meanwhile achieve the maximal communication rate of the D2D user. The method provided by the embodiment of the invention comprises the steps of: determining a low-interference user set according to obtained first, second, third and fourth distances; obtaining a traversal rate when a D2D transmitter and a D2D receiver multiplex the uplink frequency band of a target cellular terminal during a D2D communication process according to an obtained fading parameter; determining the uplink frequency band corresponding to the maximal traversal rate to be the access parameter; and determining the optimal transmitting power of the D2D transmitter by comparing the transmitting power, the maximal transmitting power and the minimal transmitting power of the D2D transmitter. The method and device are applicable to a communication network.

Description

Method and device for determining access frequency band based on D2D communication
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for determining an access frequency band based on D2D communication.
Background
With the development of communication technology, especially the popularization of cellular networks, D2D (device to device) users are gradually introduced into a cell in order to effectively improve the spectrum utilization of the cell. During the communication process, the D2D user can directly transmit user data without going through the network, that is, the D2D user can directly transmit user data between the terminal a and the terminal B. When performing communication between D2D users, data transmission is performed using the uplink frequency band of a cellular user.
Currently, in order to reduce the communication interference existing between the D2D user and the cellular user during the communication, the resource allocation is generally performed through interference pricing, user gaming, scheduling algorithm, etc. However, the method for allocating the resources of the cellular network only reduces the probability of interference to some extent, and the problem of communication interference between the D2D user and the cellular user still exists.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining an access frequency band based on D2D communication, which can solve the problem of communication interference between a D2D user and a cellular user.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for determining an access frequency band based on D2D communication, where the method is applied to a communication network in which a base terminal, a direct device access D2D terminal, and a base station are disposed, 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:
obtaining a distance parameter, where the distance parameter includes a first distance, a second distance, a third distance and a fourth distance, the first distance is a distance from the base terminal to the base station, the second distance is a distance from the base terminal to the D2D receiver, the third distance is a distance from the D2D transmitter to the D2D receiver, and the fourth distance is a distance from the D2D transmitter to the base station;
determining a set of low interference users according to the first to fourth distances, the set of low interference users including target terminals satisfying communication access conditions of the D2D transmitter and the D2D receiver;
obtaining a fading parameter, wherein the fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment;
acquiring the traversal rate of the D2D transmitter and the D2D receiver when multiplexing the uplink frequency band of the target terminal in the D2D communication process according to the interference temperature threshold;
and determining the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as an access frequency band.
In a second aspect, an embodiment of the present invention provides an apparatus for determining an access frequency band based on D2D communication, where the apparatus is applied to a communication network in which a base terminal, a direct device access D2D terminal, and a base station are disposed, 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 apparatus includes:
an obtaining module, configured to obtain a distance parameter, where the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is a distance from the base terminal to the base station, the second distance is a distance from the base terminal to the D2D receiver, the third distance is a distance from the D2D transmitter to the D2D receiver, and the fourth distance is a distance from the D2D transmitter to the base station;
a determining module, configured to determine a set of low-interference users according to the first to fourth distances, wherein the set of low-interference users includes target terminals that satisfy communication access conditions of the D2D transmitter and the D2D receiver;
the obtaining module is further configured to obtain a fading parameter, where the fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment;
the obtaining module is further configured to obtain, according to the interference temperature threshold, a traversal rate of the D2D transmitter and the D2D receiver when the D2D communicates while multiplexing the uplink frequency band of the target terminal;
the determining module is further configured to determine an uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as an access frequency band.
According to the method and the device for determining the access frequency band based on the D2D communication, a low-interference user set is determined according to the acquired first distance to the fourth distance, then the traversal rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal in the D2D communication process is acquired aiming at each target terminal in the low-interference user set according to the acquired fading parameters, and the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate is determined to be the access frequency band. The first distance is the distance from the base terminal to the base station, 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, the fourth distance is the distance from the D2D transmitter to the base station, the low-interference user set comprises target terminals meeting 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 an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, scheduling algorithms and the like, the method and the device can determine the target terminal according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely the geographical position relationship among the cellular user, the base station and the D2D user, and then determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as the access frequency band according to the maximum value in the traversal rates. Therefore, the problem of communication interference between the D2D user and the cellular user is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a specific application scenario provided in 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 flowchart 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 flowchart 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 apparatus for determining an access frequency band based on D2D communication according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention can be used for a communication network, and the communication network can be provided with a basic terminal, a D2D terminal and a base station. Wherein the D2D terminal includes a D2D transmitter and a D2D receiver, the 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, a plurality of cellular users, base stations, DUE are providedTXAnd DUERX. Among them, DUETXFor indicating D2D transmitter, DUERXFor a D2D receiver and a cellular user for an infrastructure terminal. In the embodiment of the invention, the distance from the cellular user i to the base station can be usedIndicating, cellular users i to DUERXCan be usedIndicates, DUETXTo DUERXDistance ofCan be used by separatingIndicates, DUETXThe distance to the base station can be usedAnd (4) showing. In the embodiment of the present invention, it is considered that N cellular users in a network respectively occupy N orthogonal OFDM (orthogonal frequency division multiplexing) subcarriers in a cell, and the bandwidths are w, so that the cell is fully loaded, that is, the cellular users already occupy all uplink frequency bands of a base station, and there are no idle resources. That is, the D2D user can only share the uplink frequency band with the cellular user without intolerable interference to the cellular data transmission, if he wants to complete the data transmission.
Therefore, the 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 fig. 2, the method is performed by a network device or a server, and includes:
101. and acquiring a distance parameter.
The distance parameter comprises a first distance, a second distance, a third distance and a fourth distance, wherein 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.
As shown in fig. 1, the first distance corresponding to the cellular user i may beThe second distance corresponding to cellular user i may beThe third distance corresponding to cellular user i may beThe fourth distance corresponding to cellular user i may be
102. And determining a low-interference user set according to the first distance to the fourth distance.
Wherein the set of low interference users includes target terminals satisfying 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, which are the basic terminals belonging to the low interference user set and the basic terminals belonging to the high interference user set. According to the first to fourth distances obtained in step 101, the base terminal may be divided into different user sets, and a specific dividing manner will be provided later, which is not described herein.
103. And obtaining the fading parameters.
The fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment.
104. And acquiring the traversal rate of the D2D transmitter and the D2D receiver when the D2D communication process multiplexes the uplink frequency band of the target terminal according to the interference temperature threshold.
105. And determining the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as an access frequency band.
According to the traversal rates determined in step 104, a maximum traversal rate is determined from the traversal rates, that is, the traversal rate with the largest value among the determined traversal rates, and then the uplink frequency band of the target terminal corresponding to the maximum traversal rate is determined as an access frequency band, so as to implement communication between D2D users, that is, the D2D transmitter transmits data to the D2D receiver in the access frequency band.
According to the method for determining the access frequency band based on the D2D communication, a low-interference user set is determined according to the acquired first distance to the fourth distance, then, according to the acquired fading parameters, the traversal rate of the D2D transmitter and the D2D receiver when the uplink frequency band of the target terminal is multiplexed in the D2D communication process is acquired aiming at each target terminal in the low-interference user set, and the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate is determined to be the access frequency band. The first distance is the distance from the base terminal to the base station, 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, the fourth distance is the distance from the D2D transmitter to the base station, the low-interference user set comprises target terminals meeting 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 an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, scheduling algorithms and the like, the method and the device can determine the target terminal according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely the geographical position relationship among the cellular user, the base station and the D2D user, and then determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as the access frequency band according to the maximum value in the traversal rates. Therefore, the problem of communication interference between the D2D user and the cellular user is solved.
In order to more accurately screen out the basic terminals belonging to the low-interference user set, in an implementation manner of the embodiment of the present invention, the target terminal meeting the constraint condition in the formula may be determined by the obtained first SIR threshold, second SIR threshold, path loss factor, and the formula, and the target terminal is determined as belonging to the low-interference user set. Therefore, on the basis of the implementation shown in fig. 2, the implementation shown in fig. 3 can also be realized. Before step 102 is executed to determine the low-interference user set according to the first to fourth distances, step 106 may be further executed, and step 102 may be specifically implemented as step 1021:
106. and acquiring a first SIR threshold, a second SIR threshold and a path loss factor.
The first SIR (signal to interference ratio) threshold is a lowest SIR threshold in the D2D communication process, and the second SIR threshold is a lowest SIR threshold in communication between the base terminal and the base station.
In the embodiment of the invention, the first SIR threshold is the lowest SIR threshold that the D2D transmitter can ensure normal communication with the D2D receiver in the process that the D2D transmitter transmits data to the D2D receiver; the second SIR threshold is the lowest SIR threshold which can ensure the normal communication between the basic terminal and the base station in the process that the basic terminal sends data to the base station. It should be noted that, the specific setting manner of the first SIR threshold and the second SIR threshold is not limited in the embodiment of the present invention, and may be preset by an operator according to an empirical value.
1021. Determining that inequality is satisfiedBelonging to a set of low interference users.
Wherein,Dis the first SIR threshold to be set to the first SIR threshold,Cis the second SIR threshold, α is the path loss factor, dC2CIs a first distance, dC2DIs a second distance, dD2DIs a third distance, dD2CIs the fourth distance.
It should be noted that the path loss factor may be directly obtained from the network side, or may be obtained by calculating according to a parameter that may affect the path loss.
According to the method for determining the access frequency band based on the D2D communication, the target terminal meeting the inequality is determined to belong to the low-interference user set according to the acquired first distance to the fourth distance, then the traversal rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal in the D2D communication process is acquired aiming at each target terminal in the low-interference user set according to the acquired fading parameters, and the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate is determined to be the access frequency band. The first distance is the distance from the base terminal to the base station, 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, the fourth distance is the distance from the D2D transmitter to the base station, the low-interference user set comprises target terminals meeting 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 an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, a scheduling algorithm and the like, the method and the device can accurately determine the target terminal belonging to the low-interference user set according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely according to the geographical position relationship among the cellular user, the base station and the D2D user, and then determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as the access frequency band according to the maximum value in the traversal rates obtained aiming at the target terminal. Therefore, the problem of communication interference between the D2D user and the cellular user is solved.
In order to determine the traversal rate more accurately, in an implementation manner of the embodiment of the present invention, a calculation may be performed according to a formula to determine the traversal 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, the implementation shown in fig. 4 can also be realized. In step 104, obtaining, according to the interference temperature threshold, a traversal rate when the D2D transmitter and the D2D receiver multiplex an uplink frequency band of the target terminal in the D2D communication process, which may be specifically implemented as step 1041:
1041. according to the formulaAnd calculating to obtain the traversal rate.
Wherein,is the traversal rate of the ith target terminal, i is a positive integer greater than 0, w is the frequency band bandwidth occupied in the communication process of D2D, and gammaiIs QiSatisfies the equationWherein Q isiIs the interference temperature threshold of the normal communication between the ith target terminal and the base station in the fading environment, N0B is white Gaussian noise. In addition, N is0For power spectral density, B is bandwidth, N0And B can both be obtained directly from the network side.
According to the method for determining the access frequency band based on the D2D communication, the target terminal meeting the inequality is determined to belong to the low-interference user set according to the obtained first distance to the fourth distance, then calculation is performed according to the obtained fading parameters and the formula, the traversal rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal in the D2D communication process is obtained for each target terminal in the low-interference user set, and the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate is determined to be the access frequency band. The first distance is the distance from the base terminal to the base station, 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, the fourth distance is the distance from the D2D transmitter to the base station, the low-interference user set comprises target terminals meeting 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 an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, a scheduling algorithm and the like, the method and the device can accurately determine the target terminal belonging to the low-interference user set according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely according to the geographical position relationship among the cellular user, the base station and the D2D user, then calculate according to a formula to obtain the maximum value in the accurate traversal rate aiming at the target terminal, and therefore accurately determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as the access frequency band. Therefore, the problem of communication interference between the D2D user and the cellular user is solved.
In order to ensure that the transmission power of the D2D transmitter affects the communication of the base terminal as little as possible, in an implementation manner of the embodiment of the present invention, the transmission power of the D2D transmitter, the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter can be calculated according to a formula, and the optimal transmission power of the D2D transmitter is determined. Therefore, on the basis of the implementation shown in fig. 4, the implementation shown in fig. 5 can also be realized. After step 105 is executed to determine that the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate is the access frequency band, step 107 to step 110 may also be executed:
107. according to the formulaAnd calculating to obtain the transmitting power of the D2D transmitter.
Wherein, γ0Gamma corresponding to the maximum value in the traverse ratei，Is the transmit power of the D2D transmitter.
108. According to the formulaThe maximum transmit power of the D2D transmitter is calculated.
Wherein, PCFor the transmission power of the target terminal corresponding to the maximum value in the traverse rate, PDmaxThe maximum transmit power of the D2D transmitter.
109. According to the formulaThe minimum transmit power of the D2D transmitter is calculated.
Wherein, PDninIs the minimum transmit power of the D2D transmitter.
110. The optimal transmit power of the D2D transmitter is determined from 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, because there is no time sequence limitation in the execution process of steps 107 to 109, steps 107 to 109 may be executed simultaneously or in a certain sequence.
According to the method for determining the access frequency band based on the D2D communication, after the access frequency band is determined, calculation is performed according to a formula to obtain the transmitting power of a D2D transmitter, the maximum transmitting power of a D2D transmitter and the minimum transmitting power of a D2D transmitter, and then the optimal transmitting power of the D2D transmitter is determined according to the parameters obtained through calculation. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, a scheduling algorithm and the like, the method and the device can accurately determine the target terminal belonging to the low-interference user set according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely according to the geographical position relationship among the cellular user, the base station and the D2D user, then calculate according to a formula to obtain the maximum value in the accurate traversal rate aiming at the target terminal, and therefore accurately determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as the access frequency band. And after determining the access frequency band, obtaining the optimal transmitting power of the D2D transmitter through formula calculation. Thus, the problem of communication interference between D2D users and cellular users is solved while maximizing the rate between D2D users.
In order to accurately determine the optimal transmit power of the D2D transmitter, in one implementation of the embodiment of the present invention, the transmit power of the D2D transmitter that best satisfies the current communication environment may be finally determined according to a magnitude relationship between the transmit power of the D2D transmitter and the maximum transmit power of the D2D transmitter, as well as the minimum transmit power of the D2D transmitter. Therefore, on the basis of the implementation shown in fig. 5, the implementation shown in fig. 6 can also be realized. Wherein, the step 110 determines 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, which may be specifically implemented as steps 1101 and 1102:
1101. when in useWhen it is determinedIs the optimal transmit power of the D2D transmitter.
1102. When in useOrWhen P is determinedDmaxIs the optimal transmit power of the D2D transmitter.
In the embodiment of the present invention, the magnitude relationship between the transmission power of the D2D transmitter and the maximum transmission power of the D2D transmitter, and the minimum transmission power of the D2D transmitter may be determined 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 are calculated in steps 106 to 108, so as to determine the optimal transmission power of the D2D transmitter. I.e. according to the formulaA value for the optimal transmit power of the D2D transmitter can be determined. Wherein,is the optimal transmit power of the D2D transmitter.
According to the method for determining the access frequency band based on the D2D communication, after the access frequency band is determined, calculation is performed according to a formula to obtain the transmitting power of the D2D transmitter, the maximum transmitting power of the D2D transmitter and the minimum transmitting power of the D2D transmitter, and then the optimal transmitting power of the D2D transmitter is determined according to the size relation among the calculated parameters. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, a scheduling algorithm and the like, the method and the device can accurately determine the target terminal belonging to the low-interference user set according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely according to the geographical position relationship among the cellular user, the base station and the D2D user, then calculate according to a formula to obtain the maximum value in the accurate traversal rate aiming at the target terminal, and therefore accurately determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as the access frequency band. And after determining the access frequency band, obtaining the transmitting power of the D2D transmitter, the maximum transmitting power of the D2D transmitter and the minimum transmitting power of the D2D transmitter by formula calculation, and then determining the optimal transmitting power of the D2D transmitter according to the magnitude relation among the parameters. Thus, the problem of communication interference between D2D users and cellular users is solved while maximizing the rate between D2D users.
An embodiment of the present invention provides an apparatus 20 for determining an access frequency band based on D2D communication, where the apparatus 20 is applicable to a communication network, where a base terminal, a direct device access D2D terminal, and a base station are disposed in the communication network, a D2D terminal includes a D2D transmitter and a D2D receiver, and D2D communication is communication between a D2D transmitter and a D2D receiver, as shown in fig. 7, the apparatus 20 includes:
the obtaining module 21 is configured to obtain a distance parameter, where the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is a distance from a base station to a base station, the second distance is a distance from the base station to a D2D receiver, the third distance is a distance from a D2D transmitter to a D2D receiver, and the fourth distance is a distance from a D2D transmitter to the base station.
A determining module 22, configured to determine a set of low-interference users according to the first to fourth distances, where the set of low-interference users includes target terminals that satisfy communication access conditions of the D2D transmitter and the D2D receiver.
The obtaining module 21 is further configured to obtain a fading parameter, where the fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment.
The obtaining module 21 is further configured to obtain, according to the interference temperature threshold, a traversal rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal in the D2D communication process.
The determining module 22 is further configured to determine an uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as an access frequency band.
In an implementation manner of the embodiment of the present invention, the obtaining module 21 is further configured to obtain a first SIR threshold, a second SIR threshold, and a path loss factor, where the first SIR threshold is a lowest SIR threshold in a D2D communication process, and the second SIR threshold is a lowest SIR threshold in communication between the base terminal and the base station.
Determination module 22, in particular for determining that the inequality is satisfiedBelongs to a set of low interference users, wherein,Dis the first SIR threshold to be set to the first SIR threshold,Cis the second SIR threshold, α is the path loss factor, dC2CIs a first distance, dC2DIs a second distance, dD2DIs a third distance, dD2CIs the fourth distance.
In one implementation manner of the embodiment of the present invention, the obtaining module 21 is specifically configured to obtain the data according to a formulaAnd calculating to obtain the traversal rate, wherein,is the traversal rate of the ith target terminal, i is a positive integer greater than 0, w is the frequency band bandwidth occupied in the communication process of D2D, and gammaiIs QiSatisfies the equationWherein Q isiIs the interference temperature threshold of the normal communication between the ith target terminal and the base station in the fading environment, N0B is white Gaussian noise.
In one implementation of the embodiment of the present invention, the calculating module 23 is configured to calculate the data according to a formulaCalculating to obtain the transmitting power of the D2D transmitter, wherein gamma0Gamma corresponding to the maximum value in the traverse ratei，Is the transmit power of the D2D transmitter.
A calculation module 23, further used for calculating according to the formulaCalculating to obtain the maximum transmitting power of the D2D transmitter, wherein PCFor the transmission power of the target terminal corresponding to the maximum value in the traverse rate, PDmaxThe maximum transmit power of the D2D transmitter.
A calculation module 23, further used for calculating according to the formulaCalculating to obtain the minimum transmitting power of the D2D transmitter, wherein PDninIs the minimum transmit power of the D2D transmitter.
The determining module 22 is further configured to 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.
In one implementation of the embodiment of the present invention, the determining module 22 is specifically configured to determine whenWhen it is determinedOptimal transmit power for the D2D transmitter;
when in useOrWhen P is determinedDmaxIs the optimal transmit power of the D2D transmitter.
The device for determining the access frequency band based on the D2D communication, provided by the embodiment of the present invention, determines a low interference user set according to the obtained first to fourth distances, and then obtains, according to the obtained fading parameters, a traversal rate when the D2D transmitter and the D2D receiver multiplex the uplink frequency band of the target terminal in the D2D communication process for each target terminal in the low interference user set, and determines the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as the access frequency band. The first distance is the distance from the base terminal to the base station, 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, the fourth distance is the distance from the D2D transmitter to the base station, the low-interference user set comprises target terminals meeting 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 an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment. Compared with the prior art that resource allocation is performed through interference pricing, user gaming, scheduling algorithms and the like, the method and the device can determine the target terminal according to the geographical position relationship among the terminal, the base station, the D2D transmitter and the D2D receiver, namely the geographical position relationship among the cellular user, the base station and the D2D user, and then determine the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as the access frequency band according to the maximum value in the traversal rates. Therefore, the problem of communication interference between the D2D user and the cellular user is solved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to 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 applied to a communication network, the communication network is provided with a base terminal, a direct device access D2D terminal and a base station, the D2D terminal comprises a D2D transmitter and a D2D receiver, D2D communication is communication between the D2D transmitter and the D2D receiver, and the method comprises:
obtaining a distance parameter, where the distance parameter includes a first distance, a second distance, a third distance and a fourth distance, the first distance is a distance from the base terminal to the base station, the second distance is a distance from the base terminal to the D2D receiver, the third distance is a distance from the D2D transmitter to the D2D receiver, and the fourth distance is a distance from the D2D transmitter to the base station;
determining a set of low interference users according to the first to fourth distances, the set of low interference users including target terminals satisfying communication access conditions of the D2D transmitter and the D2D receiver;
obtaining a fading parameter, wherein the fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment;
acquiring the traversal rate of the D2D transmitter and the D2D receiver when multiplexing the uplink frequency band of the target terminal in the D2D communication process according to the interference temperature threshold;
and determining the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rate as an access frequency band.
2. The method of claim 1, wherein before determining the set of low interference users according to the first to fourth distances, the method comprises:
acquiring a first signal to interference ratio (SIR) threshold, a second SIR threshold and a path loss factor, wherein the first SIR threshold is a lowest SIR threshold in the D2D communication process, and the second SIR threshold is a lowest SIR threshold for communication between the basic terminal and the base station;
the determining a set of low interference users according to the first to fourth distances includes:
determining that inequality is satisfiedBelongs to the set of low interference users, wherein,Din order to be said first SIR-threshold,Cis the second SIR threshold, α is the path loss factor, dC2CIs the first distance, dC2DIs said second distance, dD2DIs said third distance, dD2CIs the fourth distance.
3. The method of claim 2, wherein the obtaining, according to the interference temperature threshold, a traversal rate of the D2D transmitter and the D2D receiver when multiplexing the uplink frequency band of the target terminal in the D2D communication process comprises:
according to the formulaAnd calculating to obtain the traversal rate, wherein,is the traversal rate of the ith target terminal, i is a positive integer greater than 0, w is the frequency band bandwidth occupied in the D2D communication process, and γ is the frequency band bandwidth occupied by the communication process of the ith target terminaliIs QiSatisfies the equationWherein Q isiIs the interference temperature threshold of the normal communication between the ith target terminal and the base station in the fading environment, N0B is white Gaussian noise.
4. The method according to claim 3, wherein after determining that the uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates is the access frequency band, the method includes:
according to the formulaCalculating to obtain the transmitting power of the D2D transmitter, wherein gamma is0Gamma corresponding to the maximum value in the traversal ratei，Is the transmit power of the D2D transmitter;
according to the formulaCalculating to obtain the maximum transmitting power of the D2D transmitter, wherein PCThe transmission power P of the target terminal corresponding to the maximum value in the traversal rateDmaxIs the maximum transmit power of the D2D transmitter;
according to the formulaCalculating to obtain the minimum transmitting power of the D2D transmitter, wherein PDninA minimum transmit power for the D2D transmitter;
determining an optimal transmit power of the D2D transmitter from 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 of claim 4, wherein the determining the optimal transmit power of the D2D transmitter from the transmit power of the D2D transmitter, the maximum transmit power of the D2D transmitter, and the minimum transmit power of the D2D transmitter comprises:
when in useWhen it is determinedThe optimal transmission power for the D2D transmitter;
when in useOrWhen P is determinedDmaxIs the optimal transmit power of the D2D transmitter.
6. An apparatus for determining an access frequency band based on D2D communication, wherein the apparatus is adapted for a communication network having a base terminal, a direct device access D2D terminal and a base station, the D2D terminal comprises a D2D transmitter and a D2D receiver, and the D2D communication is the communication between the D2D transmitter and the D2D receiver, the apparatus comprising:
an obtaining module, configured to obtain a distance parameter, where the distance parameter includes a first distance, a second distance, a third distance, and a fourth distance, the first distance is a distance from the base terminal to the base station, the second distance is a distance from the base terminal to the D2D receiver, the third distance is a distance from the D2D transmitter to the D2D receiver, and the fourth distance is a distance from the D2D transmitter to the base station;
a determining module, configured to determine a set of low-interference users according to the first to fourth distances, wherein the set of low-interference users includes target terminals that satisfy communication access conditions of the D2D transmitter and the D2D receiver;
the obtaining module is further configured to obtain a fading parameter, where the fading parameter is an interference temperature threshold of normal communication between the target terminal and the base station in a fading environment;
the obtaining module is further configured to obtain, according to the interference temperature threshold, a traversal rate of the D2D transmitter and the D2D receiver when the D2D communicates while multiplexing the uplink frequency band of the target terminal;
the determining module is further configured to determine an uplink frequency band of the target terminal corresponding to the maximum value in the traversal rates as an access frequency band.
7. The apparatus of claim 6, wherein the obtaining module is further configured to obtain a first SIR threshold, a second SIR threshold, and a path loss factor, wherein the first SIR threshold is a lowest SIR threshold during the D2D communication, and the second SIR threshold is a lowest SIR threshold for the communication between the base terminal and the base station;
the determining means is particularly adapted to determine that an inequality is satisfiedBelongs to the set of low interference users, wherein,Din order to be said first SIR-threshold,Cis the second SIR threshold, α is the path loss factor, dC2CIs the first distance, dC2DIs said second distance, dD2DIs said third distance, dD2CIs the fourth distance.
8. The apparatus according to claim 7, wherein the obtaining module is specifically configured to obtain the data according to a formulaAnd calculating to obtain the traversal rate, wherein,is the traversal rate of the ith target terminal, i is a positive integer greater than 0, w is the frequency band bandwidth occupied in the D2D communication process, and γ is the frequency band bandwidth occupied by the communication process of the ith target terminaliIs QiSatisfies the equationWherein Q isiIs the interference temperature threshold of the normal communication between the ith target terminal and the base station in the fading environment, N0B is white Gaussian noise.
9. The apparatus of claim 8, wherein the computing module is configured to compute the formulaCalculating to obtain the transmitting power of the D2D transmitter, wherein gamma is0Gamma corresponding to the maximum value in the traversal ratei，Is the transmit power of the D2D transmitter;
the calculation module is also used for calculating according to a formulaCalculating to obtain the maximum transmitting power of the D2D transmitter, wherein PCThe transmission power P of the target terminal corresponding to the maximum value in the traversal rateDmaxIs the maximum transmit power of the D2D transmitter;
the calculation module is also used for calculating according to a formulaCalculating to obtain the minimum transmitting power of the D2D transmitter, wherein PDninA minimum transmit power for the D2D transmitter;
the determining module is further configured to 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.
10. The device according to claim 9, characterized in that said determination module is particularly adapted to determine whenWhen it is determinedThe optimal transmission power for the D2D transmitter;
when in useOrWhen P is determinedDmaxIs the optimal transmit power of the D2D transmitter.
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