CN108064077B - The power distribution method of full duplex D2D in cellular network - Google Patents
The power distribution method of full duplex D2D in cellular network Download PDFInfo
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- CN108064077B CN108064077B CN201711350229.8A CN201711350229A CN108064077B CN 108064077 B CN108064077 B CN 108064077B CN 201711350229 A CN201711350229 A CN 201711350229A CN 108064077 B CN108064077 B CN 108064077B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
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Abstract
The present invention discloses the power distribution method of full duplex D2D in cellular network a kind of, solves the problems, such as that D2D spectrum efficiency of communication system is lower in the prior art.The present invention meet phone user minimal communications rate constraint and phone user, D2D user independent power constraint on the basis of, establish the beehive network system model for maximizing system spectral efficiency, for obtained Nonlinear Nonconvex Optimized model, the transmission power of phone user and D2D user are obtained using the power distribution method that traditional optimization and intelligent algorithm combine.The present invention considers the total frequency spectrum efficiency of full duplex D2D user and phone user, and the power distribution method proposed has the characteristics that precision is high, complexity is low, improves the reliability and spectrum efficiency of D2D communication system.
Description
Technical field
The invention belongs to fields of communication technology, further relate to one of terminal direct connection field of communication technology Cellular Networks
Full-duplex terminal leads directly to the power distribution method of D2D (Device-to-Device) in network.It is logical that the present invention can be used for wireless mobile
In the cellular network of letter, phone user uses conventional cellular communication mode and base station communication, and D2D user is multiple using full-duplex mode
D2D communication is carried out with the frequency spectrum resource of phone user, carries out the optimal power allocation of phone user and D2D user, makes system frequency
Spectrum efficiency maximizes, and promotes the availability of frequency spectrum and reliability of communication system.
Background technique
D2D communication can bring channel gain, hop count gain and spatial multiplexing gain, have and improve system performance, promote user
The advantages such as experience, extension cellular communications applications, one of the key technology being widely regarded as in next generation cellular network.It is so-called
D2D communication, referring to can be with direct communication, without the transfer of base station between D2D user.Special frequency can be used in D2D communication
Spectrum resource can also be multiplexed the frequency spectrum resource of legacy cellular user.When the frequency spectrum resource of D2D multiplexing phone user, Ke Yiti
High spectrum utilization, but phone user can be interfered, while also will receive the interference from phone user.D2D user's
Operating mode is divided into semiduplex mode and full-duplex mode, when D2D user is communicated using full-duplex mode, can further mention
Spectral efficient, but itself loop can be brought to interfere, keep disturbed condition more complicated.Therefore it needs through effective resource point
Interference is controlled with scheme, to maximize the frequency spectrum effect of communication system on the basis of guaranteeing the communication quality of phone user
Rate.
Paper " the Power Allocation Optimization for Full- that Boqun Zuo et al. is delivered at it
Duplex D2D Communications Underlaying Cellular Networks”(Networking and
Network Applications (NaNA), 2016International Conference, pp.103-108) in propose bee
A kind of power distribution method for the spectrum efficiency maximizing full duplex D2D user in nest network.This method is used for terminal direct connection system
System, in the case where guaranteeing the independent power constraint of traffic rate and each user of phone user, building D2D user's spectrum efficiency is maximized
Mathematical model, be approximately further convex problem by non-convex problem by convex approximate method, and converged to by Multilevel Iteration
The method of the optimization solution of convex problem carries out power distribution.Shortcoming existing for this method is: objective function only considered D2D
The spectrum efficiency of link does not account for phone user's spectrum efficiency, without playing the performance of full duplex system completely.
A kind of patent document " the power distribution of D2D user pair and phone user shared frequency spectrum of the Southeast China University in its application
A kind of D2D user couple and honeycomb are disclosed in method " (application number: 201710346637.X publication number: 107172574 A of CN)
The power distribution method of user sharing frequency spectrum.The realization step of this method are as follows: first, initialization the number of iterations, user distribute function
Rate and Lagrange multiplier；Second, calculate the distribution power of phone user；Third carries out one to the data rate of D2D user couple
Abbreviation after the convex approximation of rank；4th, using subgradient descent method, update user's distribution power and Lagrange multiplier；5th, judgement
Whether Lagrange multiplier restrains, if so, the distribution power matrix being currently calculated is final distribution power, if it is not, then
By cycle-index plus one, two are returned to step.It is disadvantageous in that existing for this method, this method is suitable for D2D and works
Under semiduplex mode, that objective function only considered D2D link and rate, the availability of frequency spectrum of system are lower.
Xian Electronics Science and Technology University " is changed in the cellular network of insertion D2D based on SINR increment in the patent document of its application
A kind of insertion is disclosed in the power distribution method in generation " (application number: 201310606828.7 publication numbers: 103582104 A of CN)
Power distribution method based on SINR increment iterative in the cellular network of D2D.This method is initially set up asks about the power distribution
The model of topic represents income when each iteration with the incrementss of utility function.Iterative algorithm includes: calculating utility function,
Change the SINR of the SINR and D2D communication receiver of cellular communication receiving end, calculates relevant benefit function, Comparative Profits functional value
Size is so that it is determined that increase the SINR of which class user.Be disadvantageous in that existing for this method: this method is suitable for D2D work and exists
Under semiduplex mode, the availability of frequency spectrum of whole system is not fully utilized.
Summary of the invention
It is an object of the invention to be directed to the deficiency of above-mentioned prior art, full duplex D2D in a kind of cellular network is proposed
Power distribution method can be such that the total frequency spectrum efficiency of phone user and full duplex D2D user reaches most by means of the present invention
Greatly, the availability of frequency spectrum and reliability of communication system are promoted.
Realizing the thinking of the object of the invention is: using in cellular network comprising a base station, a phone user and two D2D
Family, phone user to base station are communicated using semiduplex mode, and two D2D users are multiplexed the frequency of phone user using full-duplex mode
Spectrum resource communication, in the independent power constraint of the minimal communications rate constraint and phone user, D2D user that meet phone user
On the basis of, the beehive network system model for maximizing system spectral efficiency is established, for obtained Nonlinear Nonconvex Optimized model,
The transmitting function of phone user and D2D user are obtained using the power distribution method that traditional optimization and intelligent algorithm combine
Rate.
Realize that specific step is as follows for the object of the invention:
(1) according to the following formula, when calculating the frequency spectrum resource of no D2D user's multiplexing phone user, phone user arrives base station
Maximum information rate:
Wherein, RcuWhen the no D2D user of ' expression is multiplexed the frequency spectrum resource of phone user cu, phone user cu arrives base station
Maximum information rate, B indicate the bandwidth of beehive network system, log2Indicate the log operations with 2 bottom of for,Indicate that honeycomb is used
The maximum transmission power of family cu, hcuIndicate channel gain of the phone user cu to base station communication link, ncIndicate that base station is received
Background Noise Power；
(2) judge that phone user cu believes to the maximum of base station when no D2D user is multiplexed the frequency spectrum resource of phone user cu
Cease rate Rcu' whether be greater than beehive network system in phone user cu itself minimal information rate, if so, thening follow the steps
(3), step (11) otherwise, are executed；
(3) according to the following formula, the power distribution model for making the maximum beehive network system of spectrum efficiency is established in base station:
Objective function
Constraint condition
Wherein, max { } indicates the operation of maximizing, p1Indicate the transmission power of first D2D user, h1Indicate the
One D2D user to base station interfering link channel gain, p2Indicate the transmission power of second D2D user, h2Indicate second
A D2D user to base station interfering link channel gain, h12Indicate the communication of first D2D user to second D2D user
The channel gain of link, h2The channel gain of the interfering link of ' expression phone user to second D2D user, η indicate first
D2D user carries out the remaining loops self-interference coefficient after self-interference elimination, and second D2D user is surplus with first D2D user's
Remaining loop self-interference coefficient is equal, ndIndicate first received Background Noise Power of D2D user, second D2D user and the
One received ambient noise of D2D user is equal, h21Indicate second D2D user to first D2D user communication link
Channel gain, h1The channel gain of the interfering link of ' expression phone user to first D2D user,Indicate cellular network
The minimal information rate of the phone user cu of default,Indicate the maximum transmission power of first D2D user,Table
Show the maximum transmission power of second D2D user；
(4) when the transmission power for obtaining at least one D2D user is 0, the transmission power of phone user and two D2D users
Value:
It is 0 that (4a), which enables the transmission power of first D2D user, using active constraint condition, calculates phone user, second
System spectral efficiency value under the power combination is denoted as e1 by the transmission power level of D2D user；
It is 0 that (4b), which enables the transmission power of second D2D user, using active constraint condition, calculates phone user, first
System spectral efficiency value under the power combination is denoted as e2 by the transmission power level of D2D user；
(4c) is if e1 is greater than e2, by phone user obtained in step (4a), first D2D user, second D2D user
Power be denoted as power combination 1, otherwise, phone user obtained in step (4b), first D2D user, second D2D are used
The power at family is denoted as power combination 1；
(5) according to the following formula, when calculating the frequency spectrum resource of two D2D user concurrent multiplexing phone users, the letter of phone user
Cease velocity maximum:
Wherein, Rcu" when indicating frequency spectrum resource of two D2D user concurrent multiplexing phone user cu to base station, phone user
The information rate maximum value of cu,Indicate the minimum emissive power of first D2D user and second D2D user；
(6) judge the information rate of phone user cu when the frequency spectrum resource of two D2D user concurrent multiplexing phone users most
Big value Rcu" whether the minimal information rate not less than phone user cu itself otherwise, executes step if so, thening follow the steps (7)
Suddenly (9)；
(7) when the transmission power for obtaining two D2D users is not 0, the transmission power of phone user and two D2D users
Value:
It is constrained according to the minimum-rate of phone user, the transmission power for calculating phone user and two D2D users is more accurate
Value range calculate the transmission power of phone user, two D2D users, the bee that will be obtained using APSO algorithm
Nest user, first D2D user, second D2D user power be denoted as power combination 2；
(8) judge whether the system spectral efficiency of power combination 1 is greater than the system spectral efficiency of power combination 2, if so,
It executes step (9), otherwise, executes step (10)；
(9) by the transmission power of phone user, first D2D user and second D2D user, power combination 1 is taken respectively
In three value after execute step (12)；
(10) by the transmission power of phone user, first D2D user and second D2D user, power combination 2 is taken respectively
In three value after execute step (12)；
(11) transmission power of phone user cu is taken into its maximum value, the hair of first D2D user and second D2D user
It penetrates power and takes 0, execute step (12)；
(12) the obtained corresponding transmission power of each user is notified user, the transmitting function that user uses base station to notify by base station
Rate emits signal.
Compared with the prior art, the present invention has the following advantages:
First, the present invention is on the independent power constraint basis for the minimal communications rate constraint and user for meeting phone user
On, make D2D work in a full-duplex mode, the total frequency spectrum efficiency of maximum cellular user and D2D user overcome the prior art
Only consider the lower problem of the spectrum efficiency of D2D user's spectrum efficiency or D2D work system in a half-duplex mode, so that this
Invention improves the utilization rate of frequency spectrum.
Second, the present invention utilizes step for the spectrum efficiency optimization problem in the power distribution model of Nonlinear Nonconvex
(4) traditional optimization solves user power with the method that APSO algorithm combines in step (7) in, overcomes existing
There is technology to solve the problem of user power influences precision only with traditional optimization, so that the present invention has precision high, complicated
Spend low advantage.
Detailed description of the invention
Fig. 1 is full duplex D2D communication scenes schematic diagram in honeycomb of the invention；
Fig. 2 is flow chart of the invention；
Fig. 3 is analogous diagram of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Referring to Fig.1, the scene used the present invention is further described.
It include a base station bs, a phone user cu, first D2D user du1 and second in cellular network in Fig. 1
A D2D user du2, phone user to base station are communicated using semiduplex mode, and two D2D users are multiplexed bee using full-duplex mode
The frequency spectrum resource of nest user communicates.H in Fig. 1cuIndicate phone user cu to base station communication link channel gain, h1Indicate the
One D2D user to base station interfering link channel gain, h2Indicate second D2D user to base station interfering link letter
Road gain, h1The channel gain of the interfering link of ' expression phone user to first D2D user, h2' indicate phone user to the
The channel gain of the interfering link of two D2D users, h12Indicate first D2D user to second D2D user communication link
Channel gain, h21Indicate second D2D user to first D2D user communication link channel gain, η indicate two
D2D user carries out the remaining loops self-interference coefficient after self-interference elimination.
Referring to Fig. 2, the specific steps for completing the power distribution method of full duplex D2D in cellular network to the present invention are done into one
The detailed description of step.
Step 1, according to the following formula, when calculating the frequency spectrum resource of no D2D user's multiplexing phone user, phone user to base station
Maximum information rate:
Wherein, RcuWhen the no D2D user of ' expression is multiplexed the frequency spectrum resource of phone user cu, phone user cu arrives base station
Maximum information rate, B indicate the bandwidth of beehive network system, log2Indicate the log operations with 2 bottom of for,Indicate that honeycomb is used
The maximum transmission power of family cu, hcuIndicate channel gain of the phone user cu to base station communication link, ncIndicate that base station is received
Background Noise Power.
Step 2, judge when no D2D user is multiplexed the frequency spectrum resource of phone user cu phone user cu to the maximum of base station
Information rate Rcu' whether be greater than beehive network system in phone user cu itself minimal information rate, if so, thening follow the steps
3, otherwise, execute step 11.
Step 3, according to the following formula, the power distribution model for making the maximum beehive network system of spectrum efficiency: mesh is established in base station
Scalar functionsConstrain item
Part
Wherein, max { } indicates the operation of maximizing, p1Indicate the transmission power of first D2D user, h1Indicate the
One D2D user to base station interfering link channel gain, p2Indicate the transmission power of second D2D user, h2Indicate second
A D2D user to base station interfering link channel gain, h12Indicate the communication of first D2D user to second D2D user
The channel gain of link, h2The channel gain of the interfering link of ' expression phone user to second D2D user, η indicate first
D2D user carries out the remaining loops self-interference coefficient after self-interference elimination, and second D2D user is surplus with first D2D user's
Remaining loop self-interference coefficient is equal, ndIndicate first received Background Noise Power of D2D user, second D2D user and the
One received ambient noise of D2D user is equal, h21Indicate second D2D user to first D2D user communication link
Channel gain, h1The channel gain of the interfering link of ' expression phone user to first D2D user,Indicate cellular network
The minimal information rate of the phone user cu of default,Indicate the maximum transmission power of first D2D user,Table
Show the maximum transmission power of second D2D user.
Step 4, when the transmission power for obtaining at least one D2D user is 0, the transmitting of phone user and two D2D users
Performance number.
The transmission power for enabling first D2D user is 0, using active constraint condition, calculates phone user, second D2D
System spectral efficiency value under the power combination is denoted as e1 by the transmission power level of user.
Active constraint condition refers to that at least one is active constraint to the constraint condition in power distribution model, and honeycomb is used
The transmission power of family and D2D user are located on the boundary point for the domain that constraint condition determines.
The step of calculating the transmission power level of phone user, second D2D user is as follows:
The first step using the minimum-rate constraint condition of phone user, calculates Rule of judgment value p according to the following formula2':
Second step calculates the maximum power value for meeting minimum-rate constraint of phone user according to the following formula
Third step takes phone user's transmission powerTwo D2D user emission powers take 0 to be denoted as power combination 3, will
Phone user's transmission power takesFirst D2D user emission power takes 0, second D2D user emission power to take p2' note
For power combination 4, phone user's transmission power is takenFirst D2D user emission power takes 0, second D2D user's hair
Power is penetrated to takeIt is denoted as power combination 5, phone user's transmission power is takenFirst D2D user emission power takes 0,
Two D2D user emission powers takeIt is denoted as power combination 6.
4th step, ifThen the transmission power of phone user and two D2D users are using the value in power combination 3；
IfCalculate power combination 3 and the corresponding system spectral efficiency e3 and e4 of power combination 4, if e3 > e4, bee
The transmission power of nest user and two D2D users are using the value in power combination 3, otherwise, phone user and two D2D users'
Transmission power is using the value in power combination 4；IfIt is corresponding to calculate power combination 3, power combination 5 and power combination 6
System spectral efficiency e3, e5 and e6, if e3 >=e5 and e3 >=e6, the transmission power of phone user and two D2D users are used
Value in power combination 3, if e5 > e3 and e5 > e6, the transmission power of phone user and two D2D users are using in power combination 5
Value, if e6 > e3 and e6 > e5, the transmission power of phone user and two D2D users is using the value in power combination 6.
The transmission power for enabling second D2D user is 0, using active constraint condition, calculates phone user, first D2D
System spectral efficiency value under the power combination is denoted as e2 by the transmission power level of user.
If e1 is greater than e2, by the function of phone user obtained in step (4a), first D2D user, second D2D user
Rate is denoted as power combination 1, otherwise, by phone user obtained in step (4b), first D2D user, second D2D user
Power is denoted as power combination 1.
Step 5, according to the following formula, when calculating the frequency spectrum resource of two D2D user concurrent multiplexing phone users, phone user's
Information rate maximum value:
Wherein, Rcu" when indicating frequency spectrum resource of two D2D user concurrent multiplexing phone user cu to base station, phone user
The information rate maximum value of cu,Indicate the minimum emissive power of first D2D user and second D2D user.
Step 6, judge the information rate of phone user cu when the frequency spectrum resource of two D2D user concurrent multiplexing phone users
Maximum value Rcu" whether otherwise the minimal information rate not less than phone user cu itself, executes step if so, thening follow the steps 7
Rapid 9.
Step 7, when the transmission power for obtaining two D2D users is not 0, the transmitting of phone user and two D2D users
Performance number.
It is constrained according to the minimum-rate of phone user, the transmission power for calculating phone user and two D2D users is more accurate
Value range calculate the transmission power of phone user, two D2D users, the bee that will be obtained using APSO algorithm
Nest user, first D2D user, second D2D user power be denoted as power combination 2.
Specific step is as follows for the more accurate value range of transmission power of calculating phone user and two D2D users:
The first step calculates the upper limit of emission power value of first D2D user according to the following formula
Wherein, min expression is minimized operation.
Second step calculates the upper limit of emission power value of second D2D user according to the following formula
Third step calculates the transmitting power lower limit value of phone user cu according to the following formula
4th step obtains phone user, first D2D according to the independent power constraints of phone user and D2D user
The value range of the more accurate transmission power of user, second D2D user is respectively
Step 8, judge whether the system spectral efficiency of power combination 1 is greater than the system spectral efficiency of power combination 2, if
It is to then follow the steps 9, otherwise, executes step 10.
Step 9, by the transmission power of phone user, first D2D user and second D2D user, power packages are taken respectively
Step 12 is executed after closing three values in 1.
Step 10, by the transmission power of phone user, first D2D user and second D2D user, power packages are taken respectively
Step 12 is executed after closing three values in 2.
Step 11, the transmission power of phone user cu is taken into its maximum value, first D2D user and second D2D user
Transmission power take 0, execute step 12.
Step 12, the obtained corresponding transmission power of each user is notified user, the hair that user uses base station to notify by base station
Penetrate power transmission signal.
Effect of the invention is described in further detail below with reference to emulation experiment.
1. simulated conditions:
Emulation experiment of the invention is carried out under 7.11 software of MATLAB.In emulation experiment of the invention, honeycomb
There is a base station in network center, and coverage area is the circle of radius 500m.Phone user and D2D user are random point in honeycomb
Cloth, the distance to base station are not less than 20m, and the maximum distance between two D2D users is 50m.In the transmission power of phone user cu
It is limited to 24dBm, the upper limit of emission power of two D2D users is 24dBm.The channel gain model of link is g in systemi,j=
di,j -n, wherein i is transmitting user, and j is to receive user, and d is the distance between user i and user j, and n is path loss index, is taken
Value is 4.System bandwidth is 1Hz, and the minimum-rate of phone user requires to be 3bit/s/Hz, base station and the received noise of D2D user
Power is 10-13The minimum emissive power of W, D2D user are 0.001W.Simulation residual self-interference coefficient range be (- 110)~
(- 60) dB, simulation times are 1000 times.
2. emulation content and interpretation of result:
Emulation experiment of the invention is to make the spectrum efficiency of communications network system using the present invention and two prior arts
Maximum carries out user power distribution, and (prior art 1 is the function of the total frequency spectrum efficiency of maximum cellular user and half-duplex D2D user
Rate distribution method, the prior art 2 are the power distribution methods for maximizing the spectrum efficiency of two full duplex D2D users).To honeycomb
Communication system average spectral efficiency (ase) is emulated relative to D2D user's remaining loops interference coefficient.
The simulation experiment result of the invention is as shown in Figure 3.Horizontal axis in Fig. 3 indicates D2D user's remaining loops interference coefficient,
The longitudinal axis indicates system spectral efficiency.The system obtained by the prior art 1 frequency is indicated with the solid line towards right triangle mark in Fig. 3
The curve of spectrum efficiency indicates the curve of the system spectral efficiency obtained by the prior art 2, with the solid line that square indicates with circle mark
The solid line shown indicates the curve of the system spectral efficiency obtained by the present invention.
From figure 3, it can be seen that spectrum efficiency of the invention compares existing skill with the reduction of remaining loops interference coefficient
The degree that the spectrum efficiency of art 1 improves increases, and spectrum efficiency of the invention is 8bit/ at most higher than the spectrum efficiency of the prior art 1
s/Hz.In remaining loops interference coefficient value range, spectrum efficiency of the invention is above the spectrum efficiency of the prior art 2,
Spectrum efficiency of the invention is 1.8bit/s/Hz at most higher than the spectrum efficiency of the prior art 2.Simulation result illustrates use of the present invention
Full duplex D2D communication system the availability of frequency spectrum it is higher, the requirement of frequency spectrum anxiety can be alleviated.
Claims (2)
1. the power distribution method of full duplex D2D in a kind of cellular network, which is characterized in that include a base in cellular network
It stands, a phone user and two D2D users, phone user to base station are communicated using semiduplex mode, two D2D users' uses
Full-duplex mode is multiplexed the frequency spectrum resource communication of phone user, by carrying out optimal power to phone user and two D2D users
Distribution keeps the spectrum efficiency of beehive network system maximum, and specific steps include the following:
(1) according to the following formula, when calculating the frequency spectrum resource of no D2D user's multiplexing phone user, the maximum of phone user to base station
Information rate:
Wherein, RcuWhen the no D2D user of ' expression is multiplexed the frequency spectrum resource of phone user cu, the maximum of phone user cu to base station
Information rate, B indicate the bandwidth of beehive network system, log2Indicate the log operations with 2 bottom of for,Indicate phone user cu
Maximum transmission power, hcuIndicate channel gain of the phone user cu to base station communication link, ncIndicate the received background in base station
Noise power；
(2) judge that phone user cu is fast to the maximum information of base station when no D2D user is multiplexed the frequency spectrum resource of phone user cu
Rate Rcu' whether it is greater than the minimal information rate of phone user cu itself in beehive network system, if so, (3) are thened follow the steps, it is no
Then, step (11) are executed；
(3) according to the following formula, the power distribution model for making the maximum beehive network system of spectrum efficiency: objective function is established in base stationConstraint condition
0≤p1≤P1 max；
Wherein, max { } indicates the operation of maximizing, p1Indicate the transmission power of first D2D user, h1Indicate first
D2D user to base station interfering link channel gain, p2Indicate the transmission power of second D2D user, h2Indicate second
D2D user to base station interfering link channel gain, pcuIndicate the transmission power of phone user cu, h12Indicate first D2D
User to second D2D user communication link channel gain, h2' indicate the interference of phone user to second D2D user
The channel gain of link, the remaining loops self-interference coefficient after first D2D user's progress self-interference elimination of η expression, second
D2D user is equal with the remaining loops self-interference coefficient of first D2D user, ndIndicate first received background of D2D user
Noise power, second D2D user is equal with first received ambient noise of D2D user, h21Indicate that second D2D user arrives
The channel gain of the communication link of first D2D user, h1The interfering link of ' expression phone user to first D2D user
Channel gain,Indicate the minimal information rate of the phone user cu of beehive network system setting, P1 maxIndicate first D2D
The maximum transmission power of user,Indicate the maximum transmission power of second D2D user；
(4) when the transmission power for obtaining at least one D2D user is 0, the transmission power level of phone user and two D2D users:
It is 0 that (4a), which enables the transmission power of first D2D user, using active constraint condition, calculates phone user, second D2D
System spectral efficiency value under the power combination is denoted as e1 by the transmission power level of user；
The step of transmission power level of calculating phone user and second D2D user, is as follows:
The first step using the minimum-rate constraint condition of phone user, calculates Rule of judgment value p according to the following formula2':
Second step calculates the maximum power value for meeting minimum-rate constraint of phone user according to the following formula
Third step takes phone user's transmission powerTwo D2D user emission powers take 0 to be denoted as power combination 3, by honeycomb
User emission power takesFirst D2D user emission power takes 0, second D2D user emission power to take p2' it is denoted as power
Combination 4, phone user's transmission power is takenFirst D2D user emission power takes 0, second D2D user emission power
It takesIt is denoted as power combination 5, phone user's transmission power is takenFirst D2D user emission power takes 0, second
D2D user emission power takesIt is denoted as power combination 6；
4th step, ifThen the transmission power of phone user and two D2D users are using the value in power combination 3；IfCalculate power combination 3 and the corresponding system spectral efficiency e3 and e4 of power combination 4, if e3 > e4, honeycomb
The transmission power of user and two D2D users are using the value in power combination 3, otherwise, the hair of phone user and two D2D users
Power is penetrated using the value in power combination 4；IfIt is corresponding to calculate power combination 3, power combination 5 and power combination 6
System spectral efficiency e3, e5 and e6, if e3 >=e5 and e3 >=e6, the transmission power of phone user and two D2D users use function
Value in rate combination 3, if e5 > e3 and e5 > e6, the transmission power of phone user and two D2D users are using in power combination 5
Value, if e6 > e3 and e6 > e5, the transmission power of phone user and two D2D users are using the value in power combination 6；
It is 0 that (4b), which enables the transmission power of second D2D user, using active constraint condition, using side identical with step (4a)
Method calculates the transmission power level of phone user, first D2D user, the system spectral efficiency value under the power combination is denoted as
e2；
(4c) if e1 is greater than e2, by the function of phone user obtained in step (4a), first D2D user, second D2D user
Rate is denoted as power combination 1, otherwise, by phone user obtained in step (4b), first D2D user, second D2D user
Power is denoted as power combination 1；
(5) according to the following formula, when calculating the frequency spectrum resource of two D2D user concurrent multiplexing phone users, the information speed of phone user
Rate maximum value:
Wherein, Rcu" when indicating frequency spectrum resource of two D2D user concurrent multiplexing phone user cu to base station, phone user cu's
Information rate maximum value,Indicate the minimum emissive power of first D2D user and second D2D user；
(6) judge the information rate maximum value of phone user cu when the frequency spectrum resource of two D2D user concurrent multiplexing phone users
Rcu" whether it is not less than the minimal information rate of phone user cu itself, if so, thening follow the steps (7), otherwise, executes step
(9)；
(7) when the transmission power for obtaining two D2D users is not 0, the transmission power level of phone user and two D2D users:
It is constrained according to the minimum-rate of phone user, the transmission power for calculating phone user and two D2D users more accurately takes
It is worth range, using APSO algorithm, calculates the transmission power of phone user, two D2D users, obtained honeycomb is used
Family, first D2D user, second D2D user power be denoted as power combination 2；
Described constrains according to the minimum-rate of phone user, and the transmission power for calculating phone user and two D2D users is more smart
Specific step is as follows for true value range:
The first step calculates the upper limit of emission power value of first D2D user according to the following formula
Wherein, min expression is minimized operation；
Second step calculates the upper limit of emission power value of second D2D user according to the following formula
Third step calculates the transmitting power lower limit value of phone user cu according to the following formula
4th step obtains phone user, first D2D is used according to the independent power constraints of phone user and D2D user
Family, second D2D user the value range of more accurate transmission power be respectively
(8) judge whether the system spectral efficiency of power combination 1 is greater than the system spectral efficiency of power combination 2, if so, executing
Step (9) otherwise executes step (10)；
(9) it by the transmission power of phone user, first D2D user and second D2D user, is taken in power combination 1 respectively
Step (12) are executed after three values；
(10) it by the transmission power of phone user, first D2D user and second D2D user, is taken in power combination 2 respectively
Step (12) are executed after three values；
(11) transmission power of phone user cu is taken into its maximum value, the transmitting function of first D2D user and second D2D user
Rate takes 0, executes step (12)；
(12) the obtained corresponding transmission power of each user is notified user, user to send out using the transmission power that base station notifies by base station
Penetrate signal.
2. the power distribution method of full duplex D2D in cellular network according to claim 1, which is characterized in that step
Active constraint condition described in (4a) refers to that at least one is active constraint to the constraint condition in power distribution model, bee
The transmission power of nest user and D2D user are located on the boundary point for the domain that constraint condition determines.
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| CN109842931B (en) * | 2019-03-13 | 2021-07-09 | 南京邮电大学 | NOMA-based D2D cellular system resource allocation method |
| WO2021022436A1 (en) * | 2019-08-05 | 2021-02-11 | 深圳大学 | Relay incentive method and apparatus, electronic device, and storage medium |
| CN110808765B (en) * | 2019-08-30 | 2021-09-17 | 南京航空航天大学 | Power distribution method for optimizing spectrum efficiency of large-scale MIMO system based on incomplete channel information |
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