CN105764069A - LTE network PCI plan multi-target optimization method - Google Patents

Abstract

The invention discloses an LTE network PCI plan multi-target optimization method which comprises the following steps: parameters of all base station positions, an antenna number and antenna characteristics in a planned area are input; based on an enumeration method, a main synchronization signal, an auxiliary synchronization signal, a direction angle and an electronic downward inclination angle are used as varying parameters; an area which is not covered by signals, a model 3 interference area and a model 6 interference area are calculated and grades thereof are calculated; a case with the minimum grade is found out and corresponding planning parameters are output. According to the LTE network PCI plan multi-target optimization method, LTE network PCI plan multi-target optimization can be realized; automatic weight planning of the area which is not covered by the signals, the model 3 interference area and the model 6 interference area can be realized via customized calculation; multi-target optimization effects of lowered interference of an LTE network model 3 and an LTE network model 6, improved communication quality and an improved coverage rate can be realized.

Description

A kind of LTE network PCI plans Multipurpose Optimal Method

Technical field

The present invention relates to physical area labelling planning, particularly relate to LTE network PCI and plan Multipurpose Optimal Method.

Background technology

nullCellular mobile communication technology evolves to LTE (Long Term Evolution，LongTermEvolution) after the stage，Turn to mobile broadband technology，OFDM (OFDM: OrthogonalFrequencyDivisionMultiplexing) technology is adopted to carry out beehive net，And utilize PCI to identify sector，Its function is to discriminate between sector，A part simultaneously as the input of channel scrambling code device，Carry out channel isolation，But the scope of PCI is 1 to 504，And number of sectors is more than 504 in LTE network，Therefore must flow through multiplexing mechanism to come for new eNB (evolution base station，EvolutionNodeB) distribution PCI，When its distribution principle is LTE identical networking，Adjacent sectors PCI must be different，Otherwise disturb；During LTE inter-frequency networking, adjacent sectors PCI can be identical.

In LTE network, there is mould three interference, this makes PCI planning most important.The whole network community is equally divided into N part, interval, all communities interference value mean square deviation by patent 2015101786529, if less than predetermined threshold value, then restrains, it is achieved the reasonable disposition to PCI value；Patent 2013105346088 provides a kind of method assessing Physical Cell Identifier, and the overlay area of rasterizing LTE network forms multiple grid, obtains the PCI mould X matrix of each described grid, and for assessing the PCI overall performance of described LTE network；The PCI overall performance calculating LTE network realizes quantitative evaluation PCI planning effect.Patent 201510006238X judges the antenna air exercise situation of minizone by mathematical method, its criterion is unified, judged result whether fight each other except minizone antenna except also have quantized value for characterize antenna air exercise degree, can be used for adjacent section planning, frequency planning, scrambling code planning, PCI planning, interference judge, cover location, azimuth judgement etc..Patent 2014103846731 exports optimum programming based on genetic algorithm, to help network optimization personnel to plan the whole network LTE community PCI fast and accurately.PCI plan model, using the initial p CI information of each physical area variable as PCI plan model, is solved, obtains the optimum PCI information of each physical area by patent 2013106596767；While preventing PCI conflict, it is ensured that the multiplex distance of identical PCI is maximum, reduce PCI conflict incidence rate further.

Summary of the invention

For solving above-mentioned Problems existing and defect, the invention discloses a kind of LTE network PCI and plan Multipurpose Optimal Method, realize the automatic planning of the non-area coverage of self-defined signal calculated, mould 3 confusion area, mould 6 confusion area weight, can realize LTE network mould three, mould six interference reduces, communication quality improves, the multiple-objection optimization effect that coverage rate improves.

The purpose of the present invention is realized by following technical scheme:

A kind of LTE network PCI plans Multipurpose Optimal Method, and described method includes:

All base station locations, antenna amount and antenna features parameter in A input planning region A and planning region A；

B arranges the numerical value of the constant base station of iteration running parameter and constant iterative parameter thereof, according to the non-area coverage of signal, mould 3 confusion area, mould 6 interference region area Different Optimization demand, be respectively provided with weight c₁、c₂、c₃；

C is based on enumerative technique, with master sync signal X_is(X_is=0,1,2), auxiliary synchronous signals X_ip(X_ip=1,2 ... 167), deflection θ_i-k(k=1,2 ... n_i), electrical tilt angle γ_i(0≤γ_i<γ_imax) for running parameter；Calculate coverage L_ie, then calculate different X_is、X_ip、θ_i-k、γ_iThe non-area coverage S of signal under combination₁, mould 3 confusion area S₂, mould 6 confusion area S₃；

The non-area coverage of D signal calculated compares r₁, mould 3 confusion area compare r₂, mould 6 interference region area ratio r₃, and according to r₁、r₂And r₃With weight c₁、c₂、c₃, calculate the mark R after weighting；

E changes X_is、X_ip、θ_i-k、γ_iDeng numerical value, re-execute step C, until X_is、X_ip、θ_i-k、γ_iAll values all calculate now, search out minimum mark R, and export the projecting parameter X of correspondence_is、X_ip、θ_i-k、γ_i。

The medicine have the advantages that

Realize the automatic planning of the non-area coverage of self-defined signal calculated, mould 3 confusion area, mould 6 confusion area weight, it may be achieved the interference of LTE network mould three, mould six reduces, and communication quality improves, the multiple-objection optimization effect that coverage rate improves.

Accompanying drawing explanation

Fig. 1 is that LTE network PCI of the present invention plans Multipurpose Optimal Method.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.

The present invention is that a kind of LTE network PCI plans Multipurpose Optimal Method, as it is shown in figure 1, the method comprises the steps:

Step 10 input planning region A, planning region area is S_A；All base station location P in A_i=(x_i,y_i), antenna amount n_i, horizontal beam width 2 α_i, theoretical emission distance L_i, sky line-spacing street surface relative altitude z_i, maximum electrical tilt angle γ_imax；

Step 20 arranges the numerical value of the constant base station of iteration running parameter and constant iterative parameter thereof, according to the non-area coverage of signal, mould 3 confusion area, mould 6 interference region area Different Optimization demand, be respectively provided with weight c₁、c₂、c₃；

Step 30 is based on enumerative technique, with master sync signal X_is(X_is=0,1,2), auxiliary synchronous signals X_ip(X_ip=1,2 ... 167), deflection θ_i-k(k=1,2 ... n_i), electrical tilt angle γ_i(0≤γ_i<γ_imax) for running parameter；Calculate coverage L_ie, then calculate different X_is、X_ip、θ_i-k、γ_iThe non-area coverage S of signal under combination₁, mould 3 confusion area S₂, mould 6 confusion area S₃；

Coverage L_ieComputational methods be:

The non-area coverage S of signal₁Computational methods be:

If i-th antenna for base station horizontal beam width 2 α_i, coverage L_ie, quantity n_i, kth root antenna azimuth angle theta_{i_k}, then its area s_{i_k}For:

$s_{i\_k}={\mathrm{\&alpha;}}_i{L}_{ie}^2$

The then area coverage s of i-th base station_iFor:

If then there being base station, Building I, then the non-area coverage S of signal₁For:

S₁=s₁∪s₂∪...s_i∪...s_I

If master sync signal X_is, auxiliary synchronous signals X_ip, then its physical district ID X_iIDFor:

X_iID=X_is+3X_ip

Then different physical district IDs removed by 3 after remainder X_i3For:

X_i3=X_iIDMOD3

According to X_i3=0,1,2 form 3 new group of base stations respectively, have respectively in each group Individual base station.To group in base station again from 1 open numbering be i^(m), then mould 3 confusion area S is respectively organized^(3_m)For:

Then mould 3 confusion area S₂For:

S₂=S^(3_0)∪S^(3_1)∪S^(3_2)

Different physical district IDs removed by 6 after remainder X_i6For:

X_i6=X_iIDMOD6

According to X_i6=0,1,2,3,4,5 form 6 new group of base stations respectively, have N in each group respectively^(6_l)(l=0,1,2,3,4,5) individual base station.To group in base station again from 1 open numbering be i^(l), then mould 6 confusion area S is respectively organized^(6_l)For:

Then mould 3 confusion area S₃For:

The non-area coverage of step 40 signal calculated compares r₁, mould 3 confusion area compare r₂, mould 6 interference region area ratio r₃, and according to r₁、r₂And r₃With weight c₁、c₂、c₃, calculate the mark R after weighting；

The non-area coverage of signal compares r₁, mould 3 confusion area compare r₂, mould 6 interference region ratio r₃It is respectively as follows:

Then obtaining the mark R after weighting is:

R=c₁r₁+c₂r₂+c₃r₃

Step 50 changes X_is、X_ip、θ_i-k、γ_iDeng numerical value, re-execute step C, until X_is、X_ip、θ_i-k、γ_iAll values all calculate, now, search out minimum mark R, and export the projecting parameter X of correspondence_is、X_ip、θ_i-k、γ_i。

Although the embodiment that disclosed herein is as above.But described content is only to facilitate the embodiment understanding the present invention and adopt, is not limited to the present invention.Technical staff in any the technical field of the invention; under the premise without departing from the spirit and scope that disclosed herein; any amendment and change can be done in the formal and details implemented; but the scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims defines.

Claims (7)

1. a LTE network PCI plans Multipurpose Optimal Method, it is characterised in that described method comprises the steps:

All base station locations, antenna amount and antenna features parameter in A input planning region A and planning region A；

B arranges the numerical value of the constant base station of iteration running parameter and constant iterative parameter thereof, according to the non-area coverage of signal, mould 3 confusion area, mould 6 interference region area Different Optimization demand, be respectively provided with weight c₁、c₂、c₃；

C is based on enumerative technique, with master sync signal X_is, auxiliary synchronous signals X_ip, deflection θ_i-k, electrical tilt angle γ_iFor running parameter；Calculate coverage L_ie, then calculate different X_is、X_ip、θ_i-k、γ_iThe non-area coverage S of signal under combination₁, mould 3 confusion area S₂, mould 6 confusion area S_3,, described X_is=0,1,2, X_ip=1,2 ... 167, k=1,2 ... n_i、0≤θ_i-k<2π、0≤γ_i≤γ_imax；

The non-area coverage of D signal calculated compares r₁, mould 3 confusion area compare r₂, mould 6 interference region area ratio r₃, and according to r₁、r₂And r₃With weight c₁、c₂、c₃, calculate the mark R after weighting；

E changes X_is、X_ip、θ_i-k、γ_iNumerical value, re-executes step C, until X_is、X_ip、θ_i-k、γ_iAll values all calculate, now, search out minimum mark R, and export the projecting parameter X of correspondence_is、X_ip、θ_i-k、γ_i。

2. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that in described step A, planning region area is S_A；All base station location P in A_i=(x_i,y_i), antenna amount be n_i；Antenna features parameter includes: horizontal beam width 2 α_i, theoretical emission distance L_i, sky line-spacing street surface relative altitude z_i, maximum electrical tilt angle γ_imax。

3. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that in described step C, coverage L_ieComputational methods be:

$L_{ie}=\left\{\begin{array}{cc}{L}_i& {\mathrm{\&gamma;}}_i=0\\ z_i{\mathrm{cot\&gamma;}}_i& {\mathrm{\&gamma;}}_i>0,L_i{\mathrm{cos\&gamma;}}_i>z_i{\mathrm{cot\&gamma;}}_i\\ L_i{\mathrm{cos\&gamma;}}_i& {\mathrm{\&gamma;}}_i>0,L_i{\mathrm{cos\&gamma;}}_i\&le;z_i{\mathrm{cot\&gamma;}}_i\end{array}\right.$

Wherein, L_iFor theoretical emission distance, z_iRelative altitude for sky line-spacing street surface.

4. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that in described step C, the non-area coverage S of described signal₁Computational methods be:

If i-th antenna for base station horizontal beam width 2 α_i, coverage L_ie, quantity n_i, kth root antenna azimuth angle theta_{i_k}, then its area s_{i_k}For:

$s_{i\_k}={\mathrm{\&alpha;}}_i{L}_{ie}^2$

The then area coverage s of i-th base station_iFor:

$s_i=s_{i\_1}\&cup;s_{i\_2}\&cup;...s_{i\_k}\&cup;...s_{i\_n_i}$

If then there being base station, Building I, then the non-area coverage S of signal₁For:

S₁=s₁∪s₂∪...s_i∪...s_I。

5. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that described mould 3 confusion area S₂Computational methods be:

If master sync signal X_is, auxiliary synchronous signals X_ip, then its physical district ID X_iIDFor:

X_iID=X_is+3X_ip

Then different physical district IDs removed by 3 after remainder X_i3For:

X_i3=X_iIDMOD3

According to X_i3=0,1,2 form 3 new group of base stations respectively, have respectively in each groupIndividual base station, wherein m=0,1,2；To group in base station again from 1 open numbering be i^(m), then mould 3 confusion area S is respectively organized^(3_m)For:

$S^{(3\_m)}=\underset{i=1}{\overset{N^{(3\_m)}}{\&cup;}}\underset{j\&NotEqual;i}{\overset{i}{\underset{j=1}{\&cup;}}}{s}_i^{(3\_m)}\&cap;s_j^{(3\_m)}$

Then mould 3 confusion area S₂For:

S₂=S^(3_0)∪S^(3_1)∪S^(3_2)。

6. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that described mould 6 confusion area S₃Computational methods be:

Different physical district IDs removed by 6 after remainder X_i6For:

X_i6=X_iIDMOD6

According to X_i6=0,1,2,3,4,5 form 6 new group of base stations respectively, have N in each group respectively^(6_l)Individual base station, wherein l=0,1,2,3,4,5；To group in base station again from 1 open numbering be i^(l), then mould 6 confusion area S is respectively organized^(6_l)For:

$S^{(6\_l)}=\underset{i=1}{\overset{N^{(6\_l)}}{\&cup;}}\underset{j\&NotEqual;i}{\overset{i}{\underset{j=1}{\&cup;}}}{s}_i^{(6\_l)}\&cap;s_j^{(6\_l)}$

Then mould 3 confusion area S₃For:

$S_3=\underset{l=1}{\overset{l}{\&cup;}}{S}^{(6\_l)}.$

7. LTE network PCI as claimed in claim 1 plans Multipurpose Optimal Method, it is characterised in that in described step D, described r₁、r₂And r₃With weight c₁、c₂、c₃, the method calculating the mark R after weighting is:

The non-area coverage of signal compares r₁, mould 3 confusion area compare r₂, mould 6 interference region ratio r₃It is respectively as follows:

$r_1=\frac{S_1}{S},r_2=\frac{S_2}{S},r_3=\frac{S_3}{S}$

Then obtaining the mark R after weighting is:

R=c₁r₁+c₂r₂+c₃r₃。