CN104917575A - Monitoring point layout optimization method for radio environment monitoring - Google Patents

Monitoring point layout optimization method for radio environment monitoring Download PDF

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CN104917575A
CN104917575A CN201510178997.4A CN201510178997A CN104917575A CN 104917575 A CN104917575 A CN 104917575A CN 201510178997 A CN201510178997 A CN 201510178997A CN 104917575 A CN104917575 A CN 104917575A
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electric charge
monitoring
point
point electric
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CN104917575B (en
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张轶凡
冯志勇
黄亚建
周浩
陈凯
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Beijing University of Posts and Telecommunications
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Abstract

The invention discloses a monitoring point layout optimization method for radio environment monitoring. The method comprises the following steps: discriminating areas, where points cannot be distributed, and areas, where points can be distributed, in a target area, discretizing a boundary of the target area and boundaries of the areas, where the points cannot be distributed, in the target area, setting fixed point charges for discrete points, randomly arranging monitoring points in the areas, where the points can be distributed, in the target area, setting free point charges for the monitoring points, adjusting positions of the monitoring points, analyzing forced conditions of the free point charges, and, when the free point charges of the monitoring points are at a force balance state, determining positions of the current free point charges as the best monitoring point positions. Through the optimization method put forward by the invention, the monitoring points can be rationally distributed in the areas where the points can be distributed and can also avoid the areas where the points cannot be distributed.

Description

A kind of monitoring point optimizing method for disposing for radio environment monitoring
Technical field
The present invention relates to radio environment monitoring technique field, particularly relate to a kind of monitoring point optimizing method for disposing for radio environment monitoring.
Background technology
The fast development of radio communication technology, make sharply to increase the demand of radio spectrum resources on the one hand, and the in short supply of frequency spectrum resource has become one of bottleneck of future radios technical development.On the other hand, along with the access of a large amount of wireless device, radio environment becomes and becomes increasingly complex, and wherein there is a large amount of illegal frequency phenomenon.For the problem of frequency spectrum resource anxiety, the efficient frequency spectrum operation techniques such as cognitive radio are proposed in prior art.The core concept of cognitive radio technology utilizes radio environment monitoring system, and idle frequency spectrum resource dynamic frequently, and is supplied to secondary user's use by the Timeliness coverage primary user free time.In this way, the utilance of wireless frequency spectrum can greatly be improved.And for illegal by frequency situation, wireless monitor network Real-time Collection can be utilized at present illegally to use signal data frequently, structure frequency spectrum situation map, investigation is illegal with frequency equipment in time, ensure validated user frequency quality and safety, thus set up reliable radio environment monitor network.
In this context, the reasonable layout of radio monitoring network node (also claiming radio environment monitoring point) seems particularly important for radio true environment reduction precision measure.Up to the present, following two kinds are mainly contained for the sensor distributing of monitoring point in radio monitoring network:
1) spread point mode at random, namely utilize set distributed model, obtain sampling node location coordinate information at random, then correspond to the actual geographic position in monitored area;
2) gridding distribution mode, namely according to actual monitoring environment landform, again in conjunction with actual monitoring point quantity, monitored area is divided into equably the region (mesh shape can select square or triangle etc.) be made up of grid, monitoring point is then placed in the center of each grid.
Above-mentioned sensor distributing all also exists certain shortcoming.For spreading point mode at random, this mode needs a large amount of prior informations to determine the distributed model of cloth point coordinates, for different testing environments, all needs to carry out environment information acquisition to obtain separately distributed model targetedly, does not possess universality.And for gridding distribution mode, although this mode is simple, in actual radio environmental monitoring region, often there is the region being not suitable for layouting, as high building and lake etc.For the monitoring point falling into region of can not layouting, gridding distribution mode is only moved on nearest layouted zone boundary these monitoring points simply.But the radio environment of these borderline regions is often more special, overall radio environment situation can not be reacted, the accuracy of monitor message is affected greatly.
Summary of the invention
As mentioned above, in radio environment monitor network there is considerable influence for radio environment monitoring accuracy in the distribution mode of monitoring point.In order to improve radio environment monitoring accuracy, the present invention proposes a kind of monitoring point optimizing method for disposing for radio environment monitoring, making monitoring point in rationalization distribution in region of can layouting, can also avoid region of can not layouting simultaneously.
For a monitoring point optimizing method for disposing for radio environment monitoring, comprise the following steps:
Screen step, screen can not layout region and region of can layouting in monitoring objective region;
Discrete step, by the boundary discrete method in the region of can not layouting in the border of target area and target area, and arranges fixing point electric charge for discrete point;
Layout step, in the layouted region in target area random arrangement monitoring point, and arranges free point electric charge for monitoring point;
Determining step, the stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point, when the free point electric charge of each monitoring point is in stress balance state under the effect of fixing point electric charge with other free point electric charge, judge the monitoring point position of position as the best of current free point electric charge.
According to embodiments of the invention, in described determining step, behind the position of each adjustment monitoring point, the free point electric charge calculating each monitoring point before adjustment position with the stressed difference in adjusted position postpone, the size based on described difference judges whether free point electric charge is in stress balance state.
According to embodiments of the invention, described determining step searches best position by global iterative method, comprises the following steps:
S100, the stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point, calculate free point electric charge before adjustment position with the stressed difference in adjusted position postpone;
S200, judges whether described difference is greater than zero:
If so, the position of current free point electric charge is accepted according to certain probability;
Otherwise the probability according to 100% accepts the position of current free point electric charge;
S300, judges whether adjustment number of times is less than assign thresholds:
If so, step S100 is returned;
Otherwise, perform step S400;
S400, judges whether to meet end condition;
If so, step S500 is performed
Otherwise the relevant parameter that amendment global iterative calculates, returns step S100;
S500, exports the monitoring point position of position as the best of current free point electric charge.
According to embodiments of the invention, in described step S200, if described difference is greater than zero, then the probability preferably calculated according to Metropolic criterion accepts the position of current free point electric charge.
According to embodiments of the invention, in described step S400, end condition can comprise to make a concerted effort suffered by each free point electric charge to be zero or system temperature be zero.
According to embodiments of the invention, in described step S400, the relevant parameter that global iterative calculates can comprise the assign thresholds of system temperature and adjustment number of times.
Further, in described step S400, the relevant parameter of amendment iterative computation comprises the assign thresholds reducing system temperature and reset adjustment number of times.
According to embodiments of the invention, the fixing point electric charge of setting and free point electric charge, meet the condition avoiding free point electric charge to enter can not layouting region.
According to embodiments of the invention, fixing point electric charge and free point electric charge are with like charges.
Further, the electricity of fixing point electric charge is ten times of the electricity of free point electric charge.
Compared with prior art, one or more embodiment of the present invention can have the following advantages by tool:
1, in technical scheme provided by the invention, by screening can not layout region and the region of can layouting in monitoring objective region, arrange corresponding fixing point electric charge and free point electric charge, the stressing conditions based on free point electric charge finds the optimal placement position of monitoring point.The monitoring point distribution that this method obtains rationally, reaches global optimization's distribution, has very strong universality for various radio environment.
2, the present invention utilizes the interaction between fixing point electric charge and free point electric charge, guarantees, in the layouted region of monitoring site in monitoring objective region, to prevent monitoring point from entering simultaneously and can not layout in region.
3, in addition, invention also contemplates that the problem of iterative computation complexity, enable to find out globally optimal solution at short notice, reach the target of the deployment scheme completing radio monitoring point fast.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, with embodiments of the invention jointly for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the workflow diagram that the present invention proposes monitoring point optimizing method for disposing;
Fig. 2 is the workflow diagram of the monitoring point optimizing method for disposing of the embodiment of the present invention;
Fig. 3 is the building distribution schematic diagram of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the boundary discrete method of the embodiment of the present invention;
Fig. 5 is the schematic diagram of layouting randomly of the embodiment of the present invention;
Fig. 6 is the schematic diagram after the preferred arrangement of the monitoring point of the embodiment of the present invention.
Embodiment
As shown in Figure 1, the present invention proposes the monitoring point optimizing method for disposing being used for radio environment monitoring, and it comprises the following steps:
S110, examination step, screen can not layout region and the region of can layouting in monitoring objective region;
S120, discrete step, by the boundary discrete method in the region of can not layouting in the border of target area and target area, and arrange fixing point electric charge for discrete point;
S130, step of layouting, in the layouted region in target area random arrangement monitoring point, and arranges free point electric charge for monitoring point;
S140, determining step, the stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point, when the free point electric charge of each monitoring point is in stress balance state under the effect of fixing point electric charge with other free point electric charge, judge the monitoring point position of position as the best of current free point electric charge.
The present inventor proposes by the border in region of can not layouting in the border of target area and target area when the point charge fixed, and the point charge moved freely is used as in the monitoring point arranged.Because free point electric charge is subject to the effect of fixing point electric charge and other free point electric charges, free point electric charge can setting in motion.When making a concerted effort suffered by free point electric charge to be zero, when namely free point electric charge is in stress balance state, free point electric charge reaches equally distributed state.Thus, search out the optimal placement of monitoring point, reach global optimization's distribution.
In addition, the border in region of can not layouting when the point charge fixed, its benefit brought can prevent from free point electric charge from entering into can not layout in region, as building, pond etc., thus ensures that the monitoring point for radio environment monitoring in reality is only distributed in enterable region.
Shown in Fig. 2 is the specific works flow process figure of monitoring point optimizing method for disposing in one embodiment of the invention.In order to technique effect operation principle of the present invention being described He can reach, below in conjunction with this embodiment technical scheme of the present invention done and describe in detail further.
First obtain the detailed topographic map in monitoring objective region, emphasis mark can not the boundary coordinate of the distributed areas rectangle frame of each building of representative shown in Fig. 3 (also i.e.).Usually this step actual measurement data is imported in computer to form corresponding electronic chart.
By the border of target area and can not the boundary discrete method of distributed areas, and by these M discrete point when the point charge (as shown in Figure 4) that fix.The carried charge of fixing point electric charge is Q i.
Arrange N number of monitoring point randomly in layouted region in target area, and point charge (as shown in Figure 5) is freely regarded in these monitoring points.The carried charge of free point electric charge is Q j.Now, the position of monitoring point can be considered as initialization distribution.
The stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point.In this embodiment, fixing point electric charge and free point electric charge are with like charges, mutually exclusive each other.Can not in distributed areas in order to prevent free point electric charge from entering in motion process, ten times that the electricity of fixing point electric charge can be arranged to the electricity of free point electric charge, to increase the repulsive force of fixing dot-charge pair free point electric charge.I-th free point electric charge e iwith a jth fixing point electric charge e jbetween Coulomb force size be:
| | F ij | | = k | | Q i | | | | Q j | | r ij 2
Wherein k is coulomb constant, Q ifor e iinstitute's carried charge, Q jfor e jinstitute's carried charge, r ijfor the Euclidean distance between free point electric charge and fixed charge, r can be expressed as ij=|| r i-r j||.Because each free point electric charge can be subject to the Coulomb force of other M fixing point electric charges and N-1 free point electric charge, so free point electric charge e isuffered coulomb can be expressed as with joint efforts:
F i ( r ) = k · Q i · Σ j = 1 , j ≠ i N + M Q j ( r i - r j ) | | r i - r j | | 3
Wherein r iand r jbe respectively free point electric charge e iwith fixed charge e jposition.Free point electric charge is setting in motion under the effect of Coulomb force, supposes that Coulomb force remains unchanged within the Δ t time interval, free point electric charge e iacceleration be:
a i = F i ( r ) m ′
Wherein m ' is free point electric charge e iquality, suppose m '=1 here.Through the Δ t time, the distance of its motion is:
L i = 1 2 · a i · Δ t 2
Free point electric charge e is calculated according to above formula iposition in a time interval at thereafter, also namely behind the position of adjustment monitoring point, free point electric charge has new state.Under new state, free point electric charge e istressing conditions change, also need the above step of repetition to carry out iterative computation.In order to alleviate amount of calculation, after each iteration the speed of free point electric charge can be reset to 0, until e istressed be zero.Above only to free point electric charge e ianalyze, remaining also have N-1 free point electric charge, needs all to carry out iterative computation to each free point electric charge of remainder.When each monitoring point free point electric charge suffered by make a concerted effort to be zero time, just can judge that now N number of free point electric charge is evenly distributed in the layouted region in target area.In other words, global optimization's distribution is reached.Thus, the optimum arrangement mode of monitoring point is found.
Due to when carrying out iterative computation, the amount of calculation directly calculated is very large, algorithm time delay can be caused to increase, therefore how to search out the key that globally optimal solution becomes iterative computation at short notice.In order to reach the object of fast searching space optimal solution, in computational process, can Offered target equation, the change according to target equation adjusts state variation.In the present embodiment, in order to find out the stressed state constantly diminished of free point electric charge, preferably target equation is set as point charge under current state suffered make a concerted effort with under previous state suffered by the difference of making a concerted effort, that is:
Φ ( S ) = Δ F i m + 1 = | | F i m + 1 | | - | | F i m | |
Wherein that i-th free point electric charge suffered coulomb after (m+1) secondary iteration is made a concerted effort, that the i-th free point electric charge suffered coulomb after the m time iteration is made a concerted effort.Because final purpose allows make a concerted effort to level off to zero, therefore Φ (S) needs constantly to diminish.About this point, according to Metropolis decision criteria, constantly judge in an iterative process.If target equation is less than or equal to zero, then accept current state with probability 1; If target equation is greater than zero, then accept current state with certain probability.
According to Metropolis acceptance criterion, the probability equation accepting a new state is
P ( S i → S i + 1 ) = 1 Φ ( S i + 1 ) ≤ Φ ( S i ) e Φ ( S i ) - Φ ( S i + 1 ) T Φ ( S i + 1 ) > Φ ( S i )
Wherein S irepresent preceding state, S i+1represent a rear state.Herein, T representative system temperature, changes the needs that system temperature T is Metropolis acceptance criterion in simulated annealing, when iterations equals the threshold value of specifying, reduces system temperature lentamente.
System temperature between different conditions is expressed as
T i+1＝β·T i
Wherein β ∈ (0,1).
If when result is not for accepting current state, then needs to adjust position, monitoring point, also move the reposition to stochastic generation by free point electric charge, proceed iterative computation, until obtain globally optimal solution.
In this embodiment, as T=0 or F=0, state is now globally optimal solution, and free point electric charge reaches equally distributed state.In other words, zero or system temperature when being zero is when making a concerted effort suffered by each free point electric charge, the coordinate of free point electric charge is the layout coordinate (as shown in Figure 6) of monitoring point in reality, can layout in region to be evenly distributed in greatest extent in monitoring point.
The radio environment supervisory control system monitoring point location mode that the present invention proposes, compared with prior art, has very strong universality, does not need to do special process for different monitoring environments.Meanwhile, the present invention is single step sensor distributing, is in particular in following two aspects:
1) the present invention can automatically prevent monitoring point to be distributed to and can not to layout in region, and does not need the later stage to carry out aftertreatment to falling into the sampled point must put in region;
2) this method is at the sensor distributing automatically completing global optimum in region of can layouting, and does not have local optimum, and the situation must carrying out post-processed thus occurs.
And can find from the data analysis contrast of reality, the monitoring point distribution scheme provided according to this method carries out monitoring point distribution, can restore more accurate overall radio environment.
The above; be only specific embodiment of the invention case, protection scope of the present invention is not limited thereto, and is anyly familiar with those skilled in the art in technical specification of the present invention; to amendment of the present invention or replacement, all should within protection scope of the present invention.

Claims (10)

1., for a monitoring point optimizing method for disposing for radio environment monitoring, comprise the following steps:
Screen step, screen can not layout region and region of can layouting in monitoring objective region;
Discrete step, by the boundary discrete method in the region of can not layouting in the border of target area and target area, and arranges fixing point electric charge for discrete point;
Layout step, in the layouted region in target area random arrangement monitoring point, and arranges free point electric charge for monitoring point;
Determining step, the stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point, when the free point electric charge of each monitoring point is in stress balance state under the effect of fixing point electric charge with other free point electric charge, judge the monitoring point position of position as the best of current free point electric charge.
2. monitoring point according to claim 1 optimizing method for disposing, is characterized in that:
Described determining step, behind the position of each adjustment monitoring point, the free point electric charge calculating each monitoring point before adjustment position with the stressed difference in adjusted position postpone, the size based on described difference judges whether free point electric charge is in stress balance state.
3. monitoring point according to claim 2 optimizing method for disposing, is characterized in that, described determining step searches best position by global iterative method, comprises the following steps:
S100, the stressing conditions of free point electric charge is also analyzed in the position of adjustment monitoring point, calculate free point electric charge before adjustment position with the stressed difference in adjusted position postpone;
S200, judges whether described difference is greater than zero:
If so, the position of current free point electric charge is accepted according to certain probability;
Otherwise the probability according to 100% accepts the position of current free point electric charge;
S300, judges whether adjustment number of times is less than assign thresholds:
If so, step S100 is returned;
Otherwise, perform step S400;
S400, judges whether to meet end condition;
If so, step S500 is performed
Otherwise the relevant parameter that amendment global iterative calculates, returns step S100;
S500, exports the monitoring point position of position as the best of current free point electric charge.
4. monitoring point according to claim 3 optimizing method for disposing, is characterized in that:
In described step S200, if described difference is greater than zero, then the probability calculated according to Metropolic criterion accepts the position of current free point electric charge.
5. monitoring point according to claim 4 optimizing method for disposing, is characterized in that:
In described step S400, end condition comprise to make a concerted effort suffered by each free point electric charge to be zero or system temperature be zero.
6. monitoring point according to claim 4 optimizing method for disposing, is characterized in that:
In described step S400, the relevant parameter that global iterative calculates comprises the assign thresholds of system temperature and adjustment number of times.
7. monitoring point according to claim 6 optimizing method for disposing, is characterized in that:
In described step S400, the relevant parameter of amendment iterative computation comprises the assign thresholds reducing system temperature and reset adjustment number of times.
8. the monitoring point optimizing method for disposing according to Claims 1-4 any one, is characterized in that:
The fixing point electric charge arranged and free point electric charge, meet the condition avoiding free point electric charge to enter can not layouting region.
9. monitoring point according to claim 8 optimizing method for disposing, is characterized in that:
Fixing point electric charge and free point electric charge are with like charges.
10. monitoring point optimizing method for disposing according to claim 8 or claim 9, is characterized in that:
The electricity of fixing point electric charge is ten times of the electricity of free point electric charge.
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