CN107567037A - Efficiency power distribution method, system and the storage medium of centralized antenna system - Google Patents
Efficiency power distribution method, system and the storage medium of centralized antenna system Download PDFInfo
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- CN107567037A CN107567037A CN201710655933.8A CN201710655933A CN107567037A CN 107567037 A CN107567037 A CN 107567037A CN 201710655933 A CN201710655933 A CN 201710655933A CN 107567037 A CN107567037 A CN 107567037A
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- 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
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Abstract
The present invention discloses efficiency power distribution method, system and the storage medium of a kind of centralized antenna system, and its method includes：D2D communications are added among cas system by default D2D selection algorithms and establish system model；Efficiency power distribution optimization is carried out based on system model and default efficiency power distribution algorithm.The EE that traditional cellular system substantially increases system is used alone in D2D communications of the present invention compared with cellular communication combines, the power distribution algorithm of energy efficiency further increases the EE of whole system simultaneously, and effect can be more obvious in the case where both power distribution algorithms of D2D communications and energy efficiency combine.
Description
Technical field
The present invention relates to the efficiency power point of channelling code transmission technical field, more particularly to a kind of centralized antenna system
Method of completing the square method, system and storage medium.
Background technology
Many performance indications are proposed among the research of the 5th generation (5g) mobile technology to meet that higher mobile data passes
Defeated speed, battery consumption is reduced, energy efficiency (EE) is improved while increasing service quality.With global mobile data flow
Rapid growth, current network and infrastructure can not tackle growing demand, therefore improve the service efficiency of communication network
Become more and more important.Green communications, particularly in wireless network, it is intended to maximize EE communication networks have become one it is important
Research field.In reality, up EE compares descending much more significant, this be primarily due to descending base station (BS) can support it is various
Regenerative resource, but up user (UE) energy only has limited battery.
In recent years, equipment room (D2D) communication is widely used in the handling capacity and EE of raising system.D2D communications can be held very much
Change places the direct contact established between two equipment.This permission is transmitted from an equipment to another equipment in short haul connection
Substantial amounts of data, directly link up between equipment, and can alleviate in many cases wirelessly without BSs help, this advantage
Communication system is overloaded, but also can reduce the energy resource consumption of system.But among research, most of researchs are in structure model
When simply add D2D communications at random after phone user is formed to user, actually have ignored D2D user to being led to from those
Believe what is elected among second-rate phone user, and seldom research is adapted to use in view of which type of phone user
D2D communicates, and seldom considers that UEs and D2D communication users position changes over time and changed.And in reality, with UEs's
It is mobile, the change of D2D communication members and position can be also caused while position constantly changes.For considering user mobility
Efficiency power optimization problem in centralized antenna system (CAS) does not draw related conclusions.
The content of the invention
It is a primary object of the present invention to provide efficiency power distribution method method, the system of a kind of centralized antenna system
And storage medium, to solve the problems, such as the efficiency power optimization in CAS.
In order to achieve the above object, the present invention proposes a kind of efficiency power distribution method of centralized antenna system, including
Following steps：
D2D communications are added among cas system by default D2D selection algorithms and establish system model；
Efficiency power distribution optimization is carried out based on the system model and default efficiency power distribution algorithm.
Wherein, it is described that efficiency power distribution optimization is carried out based on the system model and default efficiency power distribution algorithm
The step of include：
The maximum transmission power and minimum transmission rate of UE in the system model is obtained, and D2D centerings user is most
Big transmission power and minimum transmission rate；
Obtain meet UE and D2D centering users minimum transmission rate and maximum transmission power under conditions of maximize system
The EE of system；
By default efficiency power distribution algorithm and subgradient iteration method is used, the EE of the maximization system is entered
The convex optimization of row.
Wherein, the efficiency power distribution method of the centralized antenna system also includes：
Numerical result assessment is carried out in different power consumption models to adding D2D communications in CAS.
Wherein, the subgradient iteration method is sub-gradient alternative manners.
The present invention also proposes a kind of efficiency power distribution system of centralized antenna system, including：Computer program, it is described
When computer program is configured to be called by processor, the step of performing method as described above.
The present invention also proposes a kind of computer-readable recording medium, including：The computer-readable recording medium storage has
Computer program, when the computer program is configured to be called by processor, the step of performing method as described above.
Beneficial effects of the present invention are：
System model is established to selection algorithm by D2D, to adapt to CAS reality, based on system model and in advance
If efficiency power distribution algorithm carry out efficiency power distribution optimization.On the EE optimization problems of user power distribution, pass through one
The method of determining is converted into convex optimization problem, and is applied to by sub-gradient alternative manners to solve the convex problem.Numerical value knot
Fruit shows that the EE that traditional cellular system substantially increases system is used alone in D2D communications compared with cellular communication combines.Together
When energy efficiency power distribution algorithm further increase the EE of whole system, and in D2D communications and the work(of energy efficiency
Both rate allocation algorithms combine lower effect can be more obvious.
Brief description of the drawings
Fig. 1 is the efficiency power distribution method schematic flow sheet of centralized antenna system of the present invention；
Fig. 2 is the idiographic flow schematic diagram of the present invention；
Fig. 3 is the schematic flow sheet of inventive algorithm one；
Fig. 4 is the schematic flow sheet of inventive algorithm two；
Fig. 5 is the average size schematic diagram of UE under the more different maximum transmission powers of the present invention；
Fig. 6 be the present invention when the maximum transmission power of UE and D2D users is set as 30dBm user average size with
The increased change schematic diagram of number of users；
Fig. 7 and Fig. 8 be shown in number of users for EE in the case of 50 under preferable and physical condition with maximum transmitted work(
Relation schematic diagram between rate；
Fig. 9 is that system EE communicates in traditional mode and addition D2D respectively when UE and D2D users transimission power is 30dBm
In the case of relation between number of users.
In order that technical scheme is clearer, clear, it is described in further detail below in conjunction with accompanying drawing.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Specifically, as shown in figure 1, present pre-ferred embodiments propose a kind of efficiency power distribution of centralized antenna system
Method, including：
Step S1, D2D communications are added among cas system by default D2D selection algorithms and establish system model；
Step S2, efficiency power distribution optimization is carried out based on the system model and default efficiency power distribution algorithm.
Wherein, it is described that efficiency power distribution optimization is carried out based on the system model and default efficiency power distribution algorithm
The step of include：
The maximum transmission power and minimum transmission rate of UE in the system model is obtained, and D2D centerings user is most
Big transmission power and minimum transmission rate；
Obtain meet UE and D2D centering users minimum transmission rate and maximum transmission power under conditions of maximize system
The EE of system；
By default efficiency power distribution algorithm and subgradient iteration method is used, the EE of the maximization system is entered
The convex optimization of row.Wherein, the subgradient iteration method is sub-gradient alternative manners.
Further, the efficiency power distribution method of the centralized antenna system also includes：
Numerical result assessment is carried out in different power consumption models to adding D2D communications in CAS.
The present invention establishes system model, to adapt to CAS real feelings by D2D by such scheme to selection algorithm
Condition, efficiency power distribution optimization is carried out based on system model and default efficiency power distribution algorithm.Distributed on user power
EE optimization problems, convex optimization problem is converted into by certain method, and solution is applied to by sub-gradient alternative manners
Determine the convex optimization problem, be effectively improved the EE of whole system.
Scheme of the embodiment of the present invention detailed below：
As shown in Fig. 2 a base station is positioned over center of housing estate CAS, have the K UEs using conventional cellular communication mode with
Machine is distributed among a cell.For convenience of analysis, it is assumed here that BS and UEs be provided with single antenna, and known to them
Channel condition information (CSI) in communication.It is also supposed that passage is orthogonal, so interference problem is not present, pass through CDMA
(CDMA), FDMA or time division multiple acess (TDMA) technology this be easily achieved.UE k uplink transmission rate can be expressed as：
WhereinRepresent UE k transimission power, hk,BThe fading channel between UE k and BS is represented,Represent Gauss white noise
Sound (AWGN) power.Wherein fading channel can be expressed as
hk,B=gk,Bωk,B (2)
Wherein gk,BSmall-scale fading coefficients are represented, it is 0 variance to obey independent same distribution average for the small-scale declines of UEs
For 1 Gaussian Profile.ωk,BThe extensive fading coefficients independently of small-scale fading coefficients are represented, it can be expressed as
Wherein c represents the intermediate value average path using reference distance as 1km.dk,BUEk to BS distance is represented, α is that path is declined
Fall coefficient, general interval is [3,5].sk,BIt is shadow fading coefficient, meets logarithm normal distribution.
It is a very effective method to improve the performance of system in view of D2D communications.Meet reality using one herein
D2D communications are added among cas system by the method for border situation.Realize that algorithm is as follows：
As shown in figure 3, after D2D selection algorithms, D can be obtained to D2D user couple.Remaining biography is represented using U=K-2D
System communication user.To put it more simply, assume remaining UEs and D to D2D to occupying orthogonal subchannel respectively, so in the absence of UEs and
Interference between D2D pairs, jth can be write as to the transmission rate of the sender in D2D
WhereinThe transmission power of D2D centering senders is represented,Represent jth between D2D sender and recipients
Channel fading coefficient.σjIt is the power of white Gaussian noise.
The total bandwidth of system is arranged to 1, so the speed of uplink can be write as in traditional CAS
After addition D2D communications, CAS uplink transmission rate can be write as
In total power consumption model, actual power loss is made up of three parts in CAS, is represented by：
Wherein τ represents the efficiency of radio-frequency power amplifier, PdyAnd PstThe dynamically power attenuation with static state is represented respectively.
After D2D communications are added, total transmission work(P of systemtRate is expressed as
Under ideal conditions, it means that circuit consumption power is zero.Therefore, preferable power consumption can be expressed as：
In CAS models, EE is represented by：
RtotalIt is CAS total capacity.PtotalThere are two kinds of possibility, when in actual power loss model, PtotalBe represented by as
(7) shown in formula；When in preferable power consumption model, PtotalAs shown in (9) formula.
Added in CAS after D2D communications, consideration meets UEs and D2D users minimum transmission rate and emission maximum work(
The EE of system is maximized under conditions of rate.This optimization problem can be described as：
WhereinWithRespectively in expression system UE maximum transmission power and minimum transmission rate.Similarly,
WithRespectively in expression system D2D centering senders maximum transmission power and minimum transmission rate.
Because formula (11) is a non-convex, nonlinear function, traditional convex optimization method can not be directly used.Therefore, originally
Invention is transformed into it the optimization problem of a subtraction form, can be expressed as：
According to following theorem, the relation between (11) and (12) formula can be obtained
Theorem：DefinitionWithIt can be obtained in (11)
To optimal power allocation [Pc*,Pd*] and if only if G (ω*)=0 and g (ω*)=[Pc*,Pd*]。
The optimization problem being very easy to find in (11) of Fractional form, it is constantly present the optimization of a subtraction form of equal value
Problem (12).So the present invention concentrates on the analysis optimization problem of equal value with (11), and devise the power point of energy efficiency
With algorithm.
It is as follows that the optimal power allocation of energy efficiency is obtained using subgradient iteration method herein
for k∈[1,2,…,U],j∈[1,2,…,D] (13)
Wherein
It is λ respectively that two multipliers are introduced in subgradient iteration methodkAnd μj, its renewal equation can be excessively as follows
Wherein i >=0 represents iterations.υiAnd δiIt is very iteration step length, is the positive number of very little.
The power distribution algorithm of energy efficiency is as follows
Finally, numerical result assessment is carried out in different power consumption models to adding D2D communications in CAS, systematic parameter
Using as shown in table 1.
The simulation parameter of table 1
As shown in figure 5, in Fig. 5, in the case where number of users is 500, UE under different maximum transmission powers is compared
Average size.As we know from the figure in CAS, the average size of user increases with the increase of maximum transmission power.In CAS
After adding D2D communications, the average size of user is much larger than conventional communication mode.This absolutely proves that D2D communications are increase CAS users
A kind of effective means of capacity.
Fig. 6 represents the average size of the user when the maximum transmission power of UE and D2D users is set as 30dBm with user
The increased change of quantity., it is clear that in traditional CAS, the average size of user does not increase when number of users increase, when
After D2D communications are added in CAS, the average size of user is much larger than conventional situation, and can increase with the increase of UE quantity
Add.
Fig. 7 and Fig. 8 be shown in number of users for EE in the case of 50 under preferable and physical condition with maximum transmission power
Between relation.It can be seen from figure 7 that EE reduces with the increase of maximum transmission power under ideal conditions.
Show in Fig. 8, EE is under physical condition as the increase of transimission power first increases subsequent reduction.Can from two width figures
To be apparent from, added in CAS after D2D communications, whole system EE under the power distribution of energy efficiency, which is much larger than, to be passed
The CAS of system pattern.
Show that system EE is respectively in traditional mode and addition when UE and D2D users transimission power is 30dBm in Fig. 9
Relation under D2D signal intelligences between number of users.As can be seen that the EE of system is in the power point by using energy efficiency
It can increase afterwards with the increase of number of users with algorithm, and after D2D communications are added in system, EE communicates in D2D
It is much larger than the situation using only allocation algorithm down with the superposition of both the power distribution algorithm of energy efficiency.Obvious explanation, D2D communications
It is a kind of increase system EE effective ways.
Compared with prior art, the present invention establishes system model by D2D to selection algorithm, to adapt to CAS real feelings
Condition, efficiency power distribution optimization is carried out based on system model and default efficiency power distribution algorithm.Distributed on user power
EE optimization problems, convex optimization problem is converted into by certain method, and solution is applied to by sub-gradient alternative manners
Determine the convex problem.Numerical result shows that traditional cellular system is used alone significantly compared with cellular communication combines in D2D communications
Ground adds EE problems.The power distribution algorithm of energy efficiency is also effectively improved the EE of whole system simultaneously, and in D2D
Both power distribution algorithms of communication and energy efficiency combine lower effect can be more obvious.
In addition, the present invention also proposes a kind of efficiency power distribution system of centralized antenna system, including：Computer journey
Sequence, when the computer program is configured to be called by processor, the step of performing method as described above, it will not be repeated here.
In addition, the present invention also proposes a kind of computer-readable recording medium, including：The computer-readable recording medium is deposited
Computer program is contained, when the computer program is configured to be called by processor, the step of performing method as described above,
This is repeated no more.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, every utilization
Equivalent structure or the flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (6)
1. the efficiency power distribution method of a kind of centralized antenna system, it is characterised in that comprise the following steps：
D2D communications are added among cas system by default D2D selection algorithms and establish system model；
Efficiency power distribution optimization is carried out based on the system model and default efficiency power distribution algorithm.
2. the efficiency power distribution method of centralized antenna system according to claim 1, it is characterised in that described to be based on
The system model and default efficiency power distribution algorithm, which carry out the step of efficiency power distribution optimizes, to be included：
Obtain the maximum transmission power and minimum transmission rate of UE in the system model, and the maximum hair of D2D centering users
Penetrate power and minimum transmission rate；
Obtain and maximize system under conditions of the minimum transmission rate for meeting UE and D2D centering users and maximum transmission power
EE；
By default efficiency power distribution algorithm and subgradient iteration method is used, the EE progress to the maximization system is convex
Optimization.
3. the efficiency power distribution method of centralized antenna system according to claim 1, it is characterised in that the concentration
The efficiency power distribution method of formula antenna system also includes：
Numerical result assessment is carried out in different power consumption models to adding D2D communications in CAS.
4. the efficiency power distribution method of centralized antenna system according to claim 3, it is characterised in that described ladder
Degree alternative manner is sub-gradient alternative manners.
A kind of 5. efficiency power distribution system of centralized antenna system, it is characterised in that including：Computer program, the meter
When calculation machine program is configured to be called by processor, the step of performing method as any one of claim 1-4.
A kind of 6. computer-readable recording medium, it is characterised in that including：The computer-readable recording medium storage has calculating
Machine program, when the computer program is configured to be called by processor, perform the method as any one of claim 1-4
The step of.
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