CN103826231A - Frequency reuse method and system combined with power control - Google Patents

Abstract

The invention provides a frequency reuse method and system combined with power control. The frequency reuse method and system refer to the power control technology and aim at overcoming the defects in the soft frequency reuse technology. The characteristic that edge users are disturbed in the soft frequency reuse technology and the characteristics of the power control technology are taken into comprehensive consideration, the single-target multi-constraint optimization problem of frequency reuse is modeled, total throughput of the edge users is maximized on the premise that the communication requirements of the different edge users are met by adjusting the frequency band width ratio of the edge users to central users and the transmission power ratio of the edge users to the central users, and therefore conflict between edge user throughput maximization and manual interference minimization is eliminated.

Description

In conjunction with frequency multiplexing method and the system of power control

Technical field

The present invention relates to mobile communication technology field, particularly relate to frequency multiplexing method and the system of a kind of combination power control.

Background technology

Along with fast development and the explosive growth of mobile device quantity of personal radio communication technology, all kinds of new business has had how new demand to the transfer of data of two-forty, how to utilize efficiently limited frequency spectrum resource to become current wireless communication network problem demanding prompt solution.

Because electromagnetic wave is in the attenuation characteristic of spatial, certain band frequency after region is used, from this region the local power away from can decay a lot so that interference is reduced to acceptable degree, now this frequency can be once multiplexing.The basic thought of Here it is channeling.Channeling is a kind of concrete methods of realizing that multi-cell cooperating resource is distributed.For a long time, channeling technology is because improving the availability of frequency spectrum, and is conducive to the construction O&M of later stage network, and receives a large amount of concerns.

In 4G LTE network, air interface physical layer technology becomes basis, specifically comprise OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology and many antennas multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology.In inside, single subdistrict, the use of OFDM technology, can guarantee that the subcarrier of inside, community is mutually orthogonal, and the use of Cyclic Prefix has reduced the mutual symbol-interference between subcarrier effectively, and meanwhile, user resists the ability of frequency selective fading and also greatly strengthens.But, between neighbor cell, there is serious interference, the performance of Cell Edge User is subject to having a strong impact on of presence of intercell interference.Under the limited prerequisite of frequency spectrum resource, how to utilize efficiently resource, reduce the interference between neighbor cell simultaneously, become and in LTE network, need one of subject matter of solution.

Existing all kinds of channeling technology mainly comprises partial frequency multiplexing and soft-frequency reuse technology.In partial frequency multiplexing technology, base station is divided into Cell Center User and Cell Edge User according to the distance of user and base station and Signal to Interference plus Noise Ratio (Signal to Interference and Noise Ratio, SINR) by user.For the user of center of housing estate, its channel conditions is relatively good, and itself is little to other area interference, and can be it, to distribute the multiplexing factor be 1 channelized frequencies collection; For the user of cell edge, it is far away apart from base station, and channel conditions is poor, but it is to other communities, the user in same frequency disturbs greatlyr, can be 3 channelized frequencies collection for it distributes the multiplexing factor.The multiplexing factor is 1 to refer to that single subdistrict is used all frequencies, and the multiplexing factor is that the Shi Sange community cooperation of 3 expressions is finished total frequency.Obviously, the multiplexing factor more multiplexing degree of high-frequency is just lower, and the interference of minizone is just less; Otherwise the degree of channeling is just higher, presence of intercell interference is just larger.

Compared with partial frequency multiplexing, soft-frequency reuse has adopted dynamic frequency duplex factor as one.All frequency ranges are divided into boss's carrier wave and auxiliary subcarrier, and the boss's carrier wave between different communities is mutually orthogonal.Boss's carrier wave can use Anywhere community, and auxiliary subcarrier can only use at the center of community.By adjusting the ratio of power threshold of auxiliary subcarrier and boss's carrier wave, can self-adapting load the distribution of and cell edge inner in community.

The multiplexing factor of partial frequency multiplexing technology flexible utilization is 1 and the multiplexing factor channeling collection that is 3, but its shortcoming is that frequency duplex factor as one fixes, and the division of frequency band is also dumb.In contrast should, the soft-frequency reuse technology that 05 year Huawei Company puts forward, the frequency distribution of central user and edge customer can, according to offered load, dynamically be adjusted in real time in base station, has improved the performance of channeling technology at radio network optimization.But we are through investigation and analyze discovery, there are following two shortcomings in soft-frequency reuse technology:

In soft-frequency reuse technology, in order to reduce the phase mutual interference of fringe region user between neighbor cell, the edge of neighbor cell uses different frequency ranges.But the frequency range that the edge customer of community uses can be identical with the frequency range of adjacent with it Cell Center User.Therefore, for edge customer, do not disturb and eliminate completely, just reduced.

In soft-frequency reuse technology, the frequency of distributing between the edge customer of neighbor cell except difference, also need mutually orthogonal, to reduce interference.But, orthogonal each other in order to guarantee sub-carrier frequencies, need signal transmission to keep in time in full accord.This is difficult to accomplish in reality.Because the subcarrier of the edge customer of neighbor cell is non-orthogonal, can cause minizone to have phase mutual interference.

Summary of the invention

Based on above-mentioned situation, the present invention proposes frequency multiplexing method and the system of a kind of combination power control, the scheme of employing is as follows:

A frequency multiplexing method for combination power control, comprises step:

Obtain the total available frequency band width F in community, total transmitting power P, and total sub-carrier number N;

Determine the relation between throughput and the Signal to Interference plus Noise Ratio of user's edge region that cell edge region user is total:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{{\mathrm{\α}}_{m}F}{N_m}\log (1+{\mathrm{SINR}}_{i,m})$

In formula, R _mrepresent the total throughput of community m fringe region user, N _mrepresent community m fringe region user's sub-carrier number, α _mrepresent the ratio of the total available frequency band width of the bin width of community m fringe region user assignment and community m, SINR _i,mrepresent that user uses the Signal to Interference plus Noise Ratio of subcarrier i at community m fringe region, the expression formula of this Signal to Interference plus Noise Ratio is:

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|{\mathrm{<figure-callout\; id="0"\; label="h"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, β _mrepresent the ratio of the total transmitting power of community m fringe region user's transmitting power and community m, | h _{0, i}| ²represent the channel gain between the base station of community m and the user of use subcarrier i, II _i,mrepresent the interference that user uses subcarrier i to be subject at community m fringe region, this interference comprises that co-channel interference and alien frequencies disturb, and community m is any one in adjacent San Ge community 1,2,3, in the time that community m is community 1:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=\mathrm{<figure-callout\; id="3"\; label="i\; N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">i</figure-callout>}}{j=1}}{\overset{N_{}}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula,

represent that respectively user uses the suffered co-channel interference of subcarrier i, alien frequencies to disturb at the fringe region of community 1, w ₁, w ₂represent respectively the weight coefficient that co-channel interference and alien frequencies disturb, both equal 1, N at sum ₂, N ₃represent respectively community 2, community 3 fringe region users' sub-carrier number, β ₂, β ₃represent respectively the ratio of the total transmitting power in community 2, community 3 fringe region users' transmitting power and community, | h _i,j| ², | h _i,l| ²represent that respectively base station is used the channel gain between subcarrier j, l and the user of use subcarrier i, d _i,lrepresent the spectral distance of subcarrier i, l, B _lthe spectral density that represents subcarrier l, f represents sample frequency, in the time that community m is community 2 or community 3, the expression formula that corresponding interference, co-channel interference, alien frequencies disturb is derived and can be obtained based on the reason same with community 1;

Under the prerequisite that meets following constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

SINR _i,m≥SINR _i ^*，

0 < α _i< 1,0 < β _i< 1, with

${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In formula, SINR _i ^*represent that user uses the predetermined value of the Signal to Interference plus Noise Ratio of subcarrier i in cell edge region;

According to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

A frequency reuse system for combination power control, comprising:

Data capture unit, for obtaining the total available frequency band width F in community, total transmitting power P, and total sub-carrier number N;

Model is set up unit, for determining the relation between cell edge region user total throughput and the Signal to Interference plus Noise Ratio of user's edge region:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\&Sigma;}}}\frac{{\mathrm{\&alpha;}}_{m}F}{N_m}\log (1+{\mathrm{SINR}}_{i,m})$

In formula, R _mrepresent the total throughput of community m fringe region user, N _mrepresent community m fringe region user's sub-carrier number, α _mrepresent the ratio of the total available frequency band width of the bin width of community m fringe region user assignment and community m, SINR _i,mrepresent that user uses the Signal to Interference plus Noise Ratio of subcarrier i at community m fringe region, the expression formula of this Signal to Interference plus Noise Ratio is:

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|{\mathrm{<figure-callout\; id="0"\; label="h"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, β _mrepresent the ratio of the total transmitting power of community m fringe region user's transmitting power and community m, | h _{0, i}| ²represent the channel gain between the base station of community m and the user of use subcarrier i, II _i,mrepresent the interference that user uses subcarrier i to be subject at community m fringe region, this interference comprises that co-channel interference and alien frequencies disturb, and community m is any one in adjacent San Ge community 1,2,3, in the time that community m is community 1:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=\mathrm{<figure-callout\; id="3"\; label="i\; N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">i</figure-callout>}}{j=1}}{\overset{N_{}}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula,

represent that respectively user uses the suffered co-channel interference of subcarrier i, alien frequencies to disturb at the fringe region of community 1, w ₁, w ₂represent respectively the weight coefficient that co-channel interference and alien frequencies disturb, both equal 1, N at sum ₂, N ₃represent respectively community 2, community 3 fringe region users' sub-carrier number, β ₂, β ₃represent respectively the ratio of the total transmitting power in community 2, community 3 fringe region users' transmitting power and community, | h _i,j| ², | h _i,l| ²represent that respectively base station is used the channel gain between subcarrier j, l and the user of use subcarrier i, d _i,lrepresent the spectral distance of subcarrier i, l, B _lthe spectral density that represents subcarrier l, f represents sample frequency, in the time that community m is community 2 or community 3, the expression formula that corresponding interference, co-channel interference, alien frequencies disturb is derived and can be obtained based on the reason same with community 1;

Model solution unit, for under the prerequisite that meets following constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

SINR _i,m≥SINR _i ^*，

0 < α _i< 1,0 < β _i< 1,

with

${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In formula, SINR _i ^*represent that user uses the predetermined value of the Signal to Interference plus Noise Ratio of subcarrier i in cell edge region;

Channeling unit, for according to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

The present invention is directed to the shortcoming of soft-frequency reuse technology, use for reference power control techniques, proposed frequency multiplexing method and the system of a kind of combination power control.Consider interference that in soft-frequency reuse technology, edge customer is subject to and the feature of power control techniques, channeling is modeled as to a single goal multiconstraint optimization problem.By adjusting bin width ratio and the through-put power ratio of edge customer and central user, meeting under the prerequisite of user SINR condition, maximizing the total throughput of edge customer.Meanwhile, consider different application scenarioss, by genetic algorithm, this optimization problem is solved.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the present invention in conjunction with the frequency multiplexing method of power control;

Fig. 2 is that Cell Edge User disturbs schematic diagram;

Fig. 3 is adjacent three cell edge region and central area frequency distribution schematic diagram;

Fig. 4 is adjacent three cell powers and frequency distribution schematic diagram;

Fig. 5 is the structural representation of the present invention in conjunction with the frequency reuse system of power control.

Embodiment

Channeling technology is directly connected to the throughput of neighbor cell edge customer, and between the throughput of Cell Edge User and neighbor cell, user's phase mutual interference is the target of a pair of mutual restriction, has compromise between the two.Current channeling technology is not eliminated and is disturbed completely, and does not meet with reality, and this makes channeling technology still have very large room for improvement.

Corresponding with channeling technology, power control techniques, as a kind of supplementary technology that reduces interference, is studied equally widely.Power control techniques is divided into uplink and downlink power control techniques.In uplink power control technology, base station according to long-term observation collect uplink channel quality feature, by power control interface to user's transmission power control parameter.The parameter that user receives according to it is adjusted transmitting power.In downlink power control technology, user's transmitting power is adjusted in base station by link adaptation techniques, with variation and the disturbed condition of counteracting to other users of adaptive channel.Power control techniques, together with channeling technology, becomes the main flow scheme that existing Inter-Cell Interference Coordination is offset.

The present invention is directed to the shortcoming of soft-frequency reuse technology, use for reference power control techniques, proposed frequency multiplexing method and the system of a kind of combination power control, for the contradiction between mutual minimum interference between the maximization of balance Cell Edge User and neighbor cell.The interference that Cell Edge User is subject to is analyzed, and according to the planing method of single goal multiple constraint, channeling is carried out to mathematical modeling, considers different application scenarioss, solves flexibly Mathematical Modeling.

The present invention, in conjunction with the frequency multiplexing method of power control, as shown in Figure 1, comprises step:

Step s101, obtain the total available frequency band width F in community, total transmitting power P, and total sub-carrier number N;

Step s102, determine the relation between throughput and the Signal to Interference plus Noise Ratio of user's edge region that cell edge region user is total;

Step s103, under the prerequisite that meets corresponding constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

Step s104, according to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

The edge customer of community can be subject to two classes and disturb, respectively: co-channel interference and alien frequencies disturb.Co-channel interference refers to the central user that uses same frequency in adjacent Liang Ge community with this Cell Edge User, the interference that edge user produces.Alien frequencies disturbs and refers to due in practice, and the frequency range of the edge customer between neighbor cell can not guarantee orthogonal completely, thereby while causing OFDM transmission, the user of cell edge produces each other alien frequencies and disturbs, and the interference figure of Cell Edge User as shown in Figure 2.

The solution of the present invention, consider community full load situation, number of users is numerous, user is uniformly distributed in community, each community can with total sub-carrier number N be the same, area ratio between fringe region and central area is fixed, and the histogram of three cell edge region and central area as shown in Figure 3.F represents the available frequency band width that each community is total, and P represents the transmitting power that each community is total, α _m, m={1,2,3} represents bin width that fringe region user obtains and the ratio of total bin width.

In order to adapt to the transmission demand of different user, the transmission band between edge customer and central user and through-put power are all different, and the frequency bandwidth between community and the distribution map of through-put power are as shown in Figure 4.

For the Sector1 of community, fringe region user's number of subcarriers is N ₁, the bin width that its distribution obtains is α ₁f, transmitting power is β ₁p, answers in contrast, and central area user's number of subcarriers is N-N ₁, bin width corresponds to (1-α ₁) F, transmitting power is (1-β ₁) P.

For the Sector2 of community, fringe region user's number of subcarriers is N ₂, the bin width that its distribution obtains is α ₂f, transmitting power is β ₂p, answers in contrast, and central area user's number of subcarriers is N-N ₂, bin width corresponds to (1-α ₂) F, transmitting power is (1-β ₂) P.

For the Sector3 of community, fringe region user's number of subcarriers is N ₃, the bin width that its distribution obtains is α ₃f, transmitting power is β ₃p, answers in contrast, and central area user's number of subcarriers is N-N ₃, bin width corresponds to (1-α ₃) F, transmitting power is (1-β ₃) P.

In order to guarantee resource distributional equity between the edge customer of different districts, set α ₁+ α ₂+ α ₃=1, β ₁+ β ₂+ β ₃=1.

User is using the subcarrier of Sector1 the inside fringe region ⁱcommunicate, the co-channel interference to its generation when it can be subject to base station in adjacent with it Sector2 and Sector3 and uses similar frequency bands, can be expressed as:

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{{\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

In formula, what represent is that user uses the suffered co-channel interference of subcarrier i at the fringe region of community Sector1.| h _i,j| ²represent that base station is used the channel gain between subcarrier j and the user of use subcarrier i, has relation with base station and user's distance, decline and shadow effect between the two.

Meanwhile, due to subcarrier between fringe region can not guarantee orthogonal each other, user can be subject to neighbor cell fringe region subcarrier alien frequencies disturb, can be expressed as:

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula, the user who represents uses the suffered alien frequencies of subcarrier i to disturb at the fringe region of community Sector1.

Because the originate impact of the generation on user of different interference is different.Co-channel interference is the interference that uses similar frequency bands to produce due to different region, mainly with base station and user between distance, shadow fading relevant; And alien frequencies interference is mainly because subcarrier is non-orthogonal, the lobe that is close to producing when subcarrier transmission is revealed relevant.The impact of co-channel interference is greater than alien frequencies and disturbs.For this reason, we set one group of weight coefficient w ₁and w ₂, user uses the interference that subcarrier i is subject at Sector1 fringe region to be expressed as:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

In formula, w ₁+ w ₂=1.

By the analysis of Sector1 the inside, can horizontal sliding obtain the disturbed condition of the edge customer of Sector2 and Sector2 the inside.In the Sector2 of community, user uses the interference that subcarrier i is subject to be expressed as:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

In formula, user in the suffered co-channel interference of the fringe region subcarrier i of community Sector2 is

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{{\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

User disturbs at the suffered alien frequencies of the fringe region subcarrier i of community Sector2

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In like manner, use the interference that subcarrier i is subject to be expressed as community Sector3 user:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

In formula, user in the suffered co-channel interference of the fringe region subcarrier i of community Sector3 is

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{{\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

User disturbs at the suffered alien frequencies of the fringe region subcarrier i of community Sector3

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

The interference analysis that each Cell Edge User is subject to, can obtain the SINR of user at each cell edge, and user is at the Signal to Interference plus Noise Ratio SINR of community Sectorm fringe region sub-carriers i _i,mcan be expressed as

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|{\mathrm{<figure-callout\; id="0"\; label="h"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, | h _{0, i}| ²channel gain between the user of the base station of m the community representing and use subcarrier i, II _i,mrepresent user's suffered interference on m community subcarrier i, m={1,2,3}, the numbering of expression community.

Now, the total throughput of the edge customer of community Sector m can be expressed as:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\&Sigma;}}}\frac{{\mathrm{\&alpha;}}_{m}F}{N_m}\log (1+{\mathrm{SINR}}_{i,m})$

In formula, N _m={ N ₁, N ₂, N ₃, m cell edge region user's of expression available subcarrier number.Above-mentioned expression be throughput described in step s102 and the relation between Signal to Interference plus Noise Ratio.

The edge customer of multiple target Wei Sange of the present invention community total throughput-maximized,

the ratio cc of the bin width of the fringe region user assignment of each community of combined optimization and total distribution bin width ₁, α ₂, α ₃ratio beta with transmitting power ₁, β ₂, β ₃, under the prerequisite meeting the demands at the SINR that guarantees user, maximize the total throughput of Cell Edge User.

Constraints described in step s103 is:

1), when user is positioned on the norator carrier wave of any one community, its SINR must be greater than a predetermined value, with guarantee communication can normally carry out: SINR _i,m>=SINR _i ^*,

2) user, between community is equally distributed, is: 0 < α in order to guarantee in community resource distributional equity between user, to set constraints _i< 1,0 < β _i< 1,

with

3), in co-channel interference, while only having the user of different districts to use identical frequency, just can produce each other interference, for this reason, set constraints and be ${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In concrete enforcement, need to adjust according to the different transmission demand of the user of zones of different ratio and selected its transmitting power of its frequency that obtains.

In the time solving above Mathematical Modeling, need to solve α ₁, α ₂, α ₃and β ₁, β ₂, β ₃six variablees, meanwhile, constraints 1) be that the transmission SINR of each subchannel to each community limits, therefore solution space is extremely huge.Consider the optimization problem that can be summed up as a single goal multiple constraint in conjunction with the frequency re-use planning of power control, the algorithm that needs design to solve single goal multiple constraint solves.Therefore this method preferably adopts the genetic algorithm (Genetic Algorithm) in multiple target multiconstraint optimization algorithm to solve for channeling Mathematical Modeling:

x:＝0

Initialization A (0) :={ a ₁(0) ..., a ₆(0) }

Calculate the fitness F of each individuality _m(0)

While(x＜＝X)do

Colony is carried out to Selecting operation

Set crossover probability, colony is carried out to crossing operation

Set variation probability, to colony's computing that makes a variation

Obtain the A of colony of future generation (x)

The processing of multiple constraint: individuality all meets constraint, target accounts for the superior for excellent;

Individuality exceeds restriction range, and the little person of plussage is dominant.

Calculate the fitness of A (t), check and whether meet stopping criterion for iteration, if do not have,

x:＝x+1

End?do

The meaning that in above-mentioned solution procedure, operator and symbol thereof represent is as follows:

1) X is the total iterations of population;

2) A (0) is six codings that variable is corresponding in Mathematical Modeling;

3) F _m(x) be the fitness of m population after the x time iteration;

4) in the time doing selection operator, adopt the mode of conventional roulette to select population;

5) what crossover probability was set is higher, can be set as 0.75, and the lower of probability setting that make a variation is set as 0.05.

Optimize different with traditional single goal, multiple-objection optimization need to be optimized multiple targets simultaneously, must process multiple fitness functions simultaneously, multi-objective genetic algorithm in algorithm frame above can solve with speed faster the solution of optimum Mathematical Modeling, by controlling stopping criterion for iteration, can guarantee solved accuracy simultaneously.

The present invention is the system corresponding with said frequencies multiplexing method in conjunction with the frequency reuse system of power control, as shown in Figure 5, comprising:

Data capture unit, for obtaining the total available frequency band width F in community, total transmitting power P, and total sub-carrier number N;

Model is set up unit, for determining the relation between cell edge region user total throughput and the Signal to Interference plus Noise Ratio of user's edge region:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\&Sigma;}}}\frac{{\mathrm{\&alpha;}}_{m}F}{N_m}\log (1+{\mathrm{SINR}}_{i,m})$

In formula, R _mrepresent the total throughput of community m fringe region user, N _mrepresent community m fringe region user's sub-carrier number, α _mrepresent the ratio of the total available frequency band width of the bin width of community m fringe region user assignment and community m, SINR _i,mrepresent that user uses the Signal to Interference plus Noise Ratio of subcarrier i at community m fringe region, the expression formula of this Signal to Interference plus Noise Ratio is:

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|{\mathrm{<figure-callout\; id="0"\; label="h"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">h</figure-callout>}}_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, β _mrepresent the ratio of the total transmitting power of community m fringe region user's transmitting power and community m, | h _{0, i}| ²represent the channel gain between the base station of community m and the user of use subcarrier i, II _i,mrepresent the interference that user uses subcarrier i to be subject at community m fringe region, this interference comprises that co-channel interference and alien frequencies disturb, and community m is any one in adjacent San Ge community 1,2,3, in the time that community m is community 1:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{{\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l={\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}}_3+1}{\overset{N-\mathrm{<figure-callout\; id="3"\; label="N"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">N</figure-callout>}3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula,

represent that respectively user uses the suffered co-channel interference of subcarrier i, alien frequencies to disturb at the fringe region of community 1, w ₁, w ₂represent respectively the weight coefficient that co-channel interference and alien frequencies disturb, both equal 1, N at sum ₂, N ₃represent respectively community 2, community 3 fringe region users' sub-carrier number, β ₂, β ₃represent respectively the ratio of the total transmitting power in community 2, community 3 fringe region users' transmitting power and community, | h _i,j| ², | h _i,l| ²represent that respectively base station is used the channel gain between subcarrier j, l and the user of use subcarrier i, d _i,lrepresent the spectral distance of subcarrier i, l, B _lthe spectral density that represents subcarrier l, f represents sample frequency, in the time that community m is community 2 or community 3, the expression formula that corresponding interference, co-channel interference, alien frequencies disturb is derived and can be obtained based on the reason same with community 1;

Model solution unit, for under the prerequisite that meets following constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

SINR _i,m≥SINR _i ^*，

0 < α _i< 1,0 < β _i< 1,

with

${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA0000467958360000022.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In formula, SINR _i ^*represent that user uses the predetermined value of the Signal to Interference plus Noise Ratio of subcarrier i in cell edge region;

Channeling unit, for according to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

As a preferred embodiment, described model solution unit, also for adopting the ratio of the total available frequency band width in the bin width of genetic algorithm for solving cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community.

As a preferred embodiment, described model solution unit adopts in the solution procedure of genetic algorithm, in the time doing selection operator, adopts the mode of roulette to select population.

As a preferred embodiment, described model solution unit adopts in the solution procedure of genetic algorithm, and crossover probability is set as to 0.75, and variation probability is set as 0.05.

As a preferred embodiment, the weight coefficient w that co-channel interference and alien frequencies disturb, according to the demand of application scenarios, is adjusted in described model solution unit ₁and w ₂.

To sum up, labor of the present invention the suffered interference of neighbor cell edge customer, not only comprise co-channel interference, also comprise alien frequencies disturb.In conjunction with power control techniques, channeling technology is optimized, there is important engineering using value, closer to reality more.The channeling problem of Jiang Duo of the present invention community is summed up as a single goal multiconstraint optimization problem, by dynamically adjusting frequency distribution coefficient and the transmitting power ratio of edge customer and central user, under the prerequisite of communication requirement that meets different edge customers, maximize edge customer total throughput, the throughput-maximized and contradiction between minimum interference each other with balance edge customer.

The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. in conjunction with a frequency multiplexing method for power control, it is characterized in that, comprise step:

Obtain the total available frequency band width F in community, total transmitting power P, and total available subcarrier is counted N;

Determine the relation between throughput and the Signal to Interference plus Noise Ratio of user's edge region that cell edge region user is total:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\&Sigma;}}}\frac{{\mathrm{\&alpha;}}_{m}F}{N_m}\log (1+{\mathrm{SINR}}_{i,m})$

In formula, R _mrepresent the total throughput of community m fringe region user, N _mrepresent community m fringe region user's sub-carrier number, α _mrepresent the ratio of the total available frequency band width of the bin width of community m fringe region user assignment and community m, SINR _i,mrepresent that user uses the Signal to Interference plus Noise Ratio of subcarrier i at community m fringe region, the expression formula of this Signal to Interference plus Noise Ratio is:

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|h_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, β _mrepresent the ratio of the total transmitting power of community m fringe region user's transmitting power and community m, | h _{0, i}| ²represent the channel gain between the base station of community m and the user of use subcarrier i, II _i,mrepresent the interference that user uses subcarrier i to be subject at community m fringe region, this interference comprises that co-channel interference and alien frequencies disturb, and community m is any one in adjacent San Ge community 1,2,3, in the time that community m is community 1:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{N_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l=N_3+1}{\overset{N-N3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula, represent that respectively user uses the suffered co-channel interference of subcarrier i, alien frequencies to disturb at the fringe region of community 1, w ₁, w ₂represent respectively the weight coefficient that co-channel interference and alien frequencies disturb, both equal 1, N at sum ₂, N ₃represent respectively community 2, community 3 fringe region users' sub-carrier number, β ₂, β ₃represent respectively the ratio of the total transmitting power in community 2, community 3 fringe region users' transmitting power and community, | h _i,j| ², | h _i,l| ²represent that respectively base station is used the channel gain between subcarrier j, l and the user of use subcarrier i, d _i,lrepresent the spectral distance of subcarrier i, l, B _lthe spectral density that represents subcarrier l, f represents sample frequency, in the time that community m is community 2 or community 3, the expression formula that corresponding interference, co-channel interference, alien frequencies disturb is derived and can be obtained based on the reason same with community 1;

Under the prerequisite that meets following constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

SINR _i,m≥SINR _i ^*，

0 < α _i< 1,0 < β _i< 1,

with

${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=j\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In formula, SINR _i ^*represent that user uses the predetermined value of the Signal to Interference plus Noise Ratio of subcarrier i in cell edge region;

According to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

2. the frequency multiplexing method of combination power according to claim 1 control, is characterized in that,

Adopt the ratio of the total available frequency band width in the bin width of genetic algorithm for solving cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community.

3. the frequency multiplexing method of combination power according to claim 2 control, is characterized in that,

Adopt in the solution procedure of genetic algorithm, in the time doing selection operator, adopt the mode of roulette to select population.

4. the frequency multiplexing method of combination power according to claim 3 control, is characterized in that,

Adopt in the solution procedure of genetic algorithm, crossover probability is set as to 0.75, variation probability is set as 0.05.

5. according to the frequency multiplexing method of the combination power control described in claim 1 or 2 or 3 or 4, it is characterized in that, also comprise step:

According to the demand of application scenarios, adjust the weight coefficient w that co-channel interference and alien frequencies disturb ₁and w ₂.

6. in conjunction with a frequency reuse system for power control, it is characterized in that, comprising:

Data capture unit, for obtaining the total available frequency band width F in community, total transmitting power P, and total sub-carrier number N;

Model is set up unit, for determining the relation between cell edge region user total throughput and the Signal to Interference plus Noise Ratio of user's edge region:

$R_m=\underset{i=1}{\overset{N_m}{\mathrm{\&Sigma;}}}\frac{{\mathrm{\&alpha;}}_{m}F}{N_m}\left(\log \right)(1+{\mathrm{SINR}}_{i,m})$

In formula, R _mrepresent the total throughput of community m fringe region user, N _mrepresent community m fringe region user's sub-carrier number, α _mrepresent the ratio of the total available frequency band width of the bin width of community m fringe region user assignment and community m, SINR _i,mrepresent that user uses the Signal to Interference plus Noise Ratio of subcarrier i at community m fringe region, the expression formula of this Signal to Interference plus Noise Ratio is:

${\mathrm{SINR}}_{i,m}=\frac{{\mathrm{\&beta;}}_{m}P{\left|h_{0,i}\right|}^2}{{\mathrm{II}}_{i,m}}$

In formula, β _mrepresent the ratio of the total transmitting power of community m fringe region user's transmitting power and community m, | h _{0, i}| ²represent the channel gain between the base station of community m and the user of use subcarrier i, II _i,mrepresent the interference that user uses subcarrier i to be subject at community m fringe region, this interference comprises that co-channel interference and alien frequencies disturb, and community m is any one in adjacent San Ge community 1,2,3, in the time that community m is community 1:

${\mathrm{II}}_{i,1}=w_1{I}_{i,1}^1+w_2{I}_{i,1}^2$

$I_{i,1}^1=\underset{\underset{j=i}{j=1}}{\overset{N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_2)P+\underset{\underset{j=i}{j=1}}{\overset{N_3}{\mathrm{\&Sigma;}}}{\left|h_{i,j}\right|}^2(1-{\mathrm{\&beta;}}_3)P$

$I_{i,1}^2=\underset{l=N_2+1}{\overset{N-N_2}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{2}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}+\underset{l=N_3+1}{\overset{N-N3}{\mathrm{\&Sigma;}}}{\left|h_{i,l}\right|}^2{\mathrm{\&beta;}}_{3}P{\&Integral;}_{d_{i,l}-B_l/2}^{d_{i,l}+B_l/2}{\left(\frac{\sin \mathrm{\&pi;fT}}{\mathrm{\&pi;fT}}\right)}^2\mathrm{df}$

In formula,

represent that respectively user uses the suffered co-channel interference of subcarrier i, alien frequencies to disturb at the fringe region of community 1, w ₁, w ₂represent respectively the weight coefficient that co-channel interference and alien frequencies disturb, both equal 1, N at sum ₂, N ₃represent respectively community 2, community 3 fringe region users' sub-carrier number, β ₂, β ₃represent respectively the ratio of the total transmitting power in community 2, community 3 fringe region users' transmitting power and community, | h _i,j| ², | h _i,l| ²represent that respectively base station is used the channel gain between subcarrier j, l and the user of use subcarrier i, d _i,lrepresent the spectral distance of subcarrier i, l, B _lthe spectral density that represents subcarrier l, f represents sample frequency, in the time that community m is community 2 or community 3, the expression formula that corresponding interference, co-channel interference, alien frequencies disturb is derived and can be obtained based on the reason same with community 1.

Model solution unit, for under the prerequisite that meets following constraints, make the adjacent San Ge community total throughput of 1,2,3 fringe region user reach maximum, solve the ratio of the total available frequency band width in the bin width of cell edge region user assignment now and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community;

SINR _i,m≥SINR _i ^*，

0 < α _i< 1,0 < β _i< 1,

with

${\left|h_{i,j}\right|}^2=\left\{\begin{array}{cc}{\left|h_{i,j}\right|}^2,& \mathrm{ifi}=j\\ 0,& \mathrm{ifi}\&NotEqual;j\end{array}\right.$

In formula, SINR _i ^*represent that user uses the predetermined value of the Signal to Interference plus Noise Ratio of subcarrier i in cell edge region;

Channeling unit, for according to the ratio of the total available frequency band width of the bin width of cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community carries out channeling.

7. the frequency reuse system of combination power according to claim 6 control, is characterized in that,

Described model solution unit, also for adopting the ratio of the total available frequency band width in the bin width of genetic algorithm for solving cell edge region user assignment and community, and the ratio of the total transmitting power of cell edge region user's transmitting power and community.

8. the frequency reuse system of combination power according to claim 7 control, is characterized in that,

Described model solution unit adopts in the solution procedure of genetic algorithm, in the time doing selection operator, adopts the mode of roulette to select population.

9. the frequency reuse system of combination power according to claim 8 control, is characterized in that,

Described model solution unit adopts in the solution procedure of genetic algorithm, and crossover probability is set as to 0.75, and variation probability is set as 0.05.

10. according to the frequency reuse system of the combination power control described in claim 6 or 7 or 8 or 9, it is characterized in that,

The weight coefficient w that co-channel interference and alien frequencies disturb, according to the demand of application scenarios, is adjusted in described model solution unit ₁and w ₂.

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