CN103269494A - Method and system for interruption compensating in wireless access network cell - Google Patents

Abstract

The invention discloses a method and system for interruption compensating in a wireless access network cell. The method includes the steps that S1, network information data are collected and monitored, and whether network interruption occurs or not in the cell is judged according to the network information data; S2, if cell network interruption occurs, whether the interruption compensating is needed to be carried out or not is judged; S3, when the interruption cell needs the interruption compensating, aiming at the terminal cell, an area coverage rate and coverage overlapping are optimized, and a particle swarm optimization algorithm is used for obtaining an optimization scheme; S4, the optimization scheme is implemented, and the network information data are collected and monitored after the optimization. According to the method and system for the interruption compensating in the wireless access network cell, the area coverage rate and coverage overlapping of the interruption cell are optimized by the adoption of the particle swarm optimization algorithm, the automatic interruption compensating of the interruption cell is achieved, the speed of the interruption compensating is improved, human interference with network operation is reduced to the maximum, and network operation efficiency is improved effectively.

Description

The compensation method of Radio Access Network cell outage and system

Technical field

The present invention relates to the Radio Access Network area of maintenance, particularly the compensation method of a kind of Radio Access Network cell outage and system.

Background technology

Along with the fast development of the communication technology and the people raising to the communication intelligence requirement, self-organizing network has become one of important directions of network technical development.In order to reduce network operation expense to greatest extent, it is one of main target of LTE (Long Term Evolution, Long Term Evolution) that self organizing function is provided.Self-organizing network mainly contains three big functions, is respectively self-configuring, self-optimizing and healing certainly.Refer to that from curing function network can detect automatically and recovers the residential quarter fault, thereby significantly reduce fault detect and handle required man power and material's cost.An importance from healing is the cell outage management, comprises that cell outage detects and two kinds of scenes of cell outage compensation.In the mobile cellular net owing to the base station sudden failure all can appear in reasons such as software and hardware failure, power failure suddenly, configuration error the cell communication interruption takes place.How interrupt compensating and become current research focus interrupting the residential quarter, its target is under no artificial operating environment, and system can be in time, recovery automatically under low performance or even the interrupt status automatically.

Application number is to disclose a kind of cell outage compensation method for self-organizing network in 201210331124.9 the Chinese patent, this invention relates to a kind of cell outage compensation method for self-organizing network, belong to the 4G communication technical field, this method comprises: select internal compensation residential quarter and external compensation residential quarter from adjacent cell, determine the adjustment parameter of compensation residential quarter; Adjust the internal compensation cell parameter successively, according to reporting of user information acquisition internal compensation performance function increment, carry out parameter and upgrade; After adjusting iteration stopping, inside carries out the outside adjusting stage; Adjust the external compensation cell parameter successively, according to reporting of user information acquisition external compensation performance function increment, carry out parameter and upgrade; After adjusting iteration stopping, the outside finishes compensation.This invention can be after detecting the cell outage generation, the disconnected community user performance of automatic centering effectively compensates, but it is not comprehensive to the optimization of interrupt network compensation in this method implementation, and need realize compensation by iteration repeatedly, length consuming time can't in time make network recover from interrupt status.

Summary of the invention

(1) technical problem that will solve

The technical problem to be solved in the present invention is: how the compensation method of a kind of Radio Access Network cell outage and system are provided, can realize the automatic compensation that subzone network interrupts, and improve speed and the compensation effect that interrupts compensation.

(2) technical scheme

For solving the problems of the technologies described above, the invention provides the compensation method of a kind of Radio Access Network cell outage, the method comprising the steps of:

S1 gathers and the monitoring network information data, judges according to described network information data whether the residential quarter network takes place interrupt;

If the S2 subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation;

When S3 need interrupt compensating when described interruption residential quarter, carry out areal coverage and cover overlapping optimization at described terminal residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme;

S4 implements described prioritization scheme, and gathers and the monitoring network information data after optimization is finished.

Preferably, described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS.

Preferably, judge according to the covering index of network whether needs interrupt compensation in the residential quarter that interruption takes place among the described step S2.

Preferably, described Radio Access Network is the LTE network in the urban area circumstance, and described covering index satisfies:

The received power value that subscriber equipment is measured the main plot is greater than-105dBm;

The quality of reception value that subscriber equipment is measured the main plot is greater than-13.8dB.

The signal of the reference signal that subscriber equipment receives and interference and noise ratio are supported minimum modulation coding mode.

Preferably, carry out areal coverage at described terminal residential quarter described in the step S3 and comprise step with the method that covers overlapping optimization:

S311 is that benchmark calculates the reference signal area coverage of the neighbor cell of computing terminal residential quarter respectively with the reference signal, and the reference signal area coverage of described neighbor cell is:

$S\left(p_{\mathrm{RS}}^i\right)=\mathrm{\π}\·{\left(g^{-1}\left({\mathrm{PL}}_{\max }^i\right)\right)}^2$

Wherein,

Be the reference signal area coverage of described neighbor cell,

Be the propagation model of described neighbor cell,

Allow path loss for described neighbor cell is maximum, i ∈ n, n are the number of described neighbor cell;

S312 utilizes the reference signal area coverage of described neighbor cell to obtain the coverage rate of whole regional reference signal, and the coverage rate of described whole regional reference signal is:

$f_{\mathrm{cov}}=100\·\frac{S\left(p_{\mathrm{RS}}^1\right)\∪S\left(p_{\mathrm{RS}}^2\right)\∪\·\·\·\∪S\left(p_{\mathrm{RS}}^n\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _CovBe the coverage rate of described whole regional reference signal, S _TargetTarget coverage zone for n neighbor cell;

S313 utilizes the reference signal area coverage of described neighbor cell to obtain the overlapping rate of covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell, and the overlapping rate of the covering of described whole regional reference signal is:

$f_{\mathrm{overlap}}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\underset{j,k\∈n,j,k\≠i}{\overset{n}{\mathrm{\Σ}}}S\left(p_{\mathrm{RS}}^i\right)\∩S\left(p_{\mathrm{RS}}^j\right)\∩S\left(p_{\mathrm{RS}}^k\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _OverlapBe the overlapping rate of the covering of whole regional reference signal.

To areal coverage and overlapping being optimized of covering, its majorized function is S314 simultaneously:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\·\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function.

Preferably, the method for utilizing particle swarm optimization algorithm to draw prioritization scheme described in the step S3 comprises step:

S321 arranges maximum iteration time, and each neighbor cell arranges position vector and velocity vector, and described position vector is X _i=(x _I1, x _I2..., x _ID), described velocity vector is V _i=(v _I1, v _I2..., v _ID), wherein D is vectorial dimension, and described iterations, each neighbor cell are arranged position vector and velocity vector initialization;

S322 brings described position vector and velocity vector into described majorized function and calculates, and utilizes the optimal solution in the optimal solution set storage iterative process;

The described iterations of S323 adds 1, and described position vector and velocity vector are upgraded

$v_{\mathrm{id}}^{t+1}=\mathrm{\&omega;}\&CenterDot;v_{\mathrm{id}}^t+c_1{r}_1(p_{\mathrm{id}}^t-x_{\mathrm{id}}^t)+c_2{r}_2(p_{\mathrm{gd}}^t-x_{\mathrm{id}}^t)$

$x_{\mathrm{id}}^{t+1}=x_{\mathrm{id}}^t+v_{\mathrm{id}}^{t+1}$

Wherein, t is iterations, c ₁, c ₂Be accelerated factor, r ₁, r ₂Be equally distributed random number in [0,1], d is the dimension in the D dimension, and ω is the inertia weight factor;

If S324 current iteration number of times repeats described step S322-S324 less than described maximum iteration time, otherwise export current optimal solution set, described current optimal solution set is described prioritization scheme.

The present invention also provides a kind of Radio Access Network cell outage bucking-out system, and this system comprises:

The information monitoring module is used for gathering and the monitoring network information data, and described network information data is stored in the information storage module;

The information analysis module, be used for analyzing stored in the described network information data of information storage module, judge whether the residential quarter network takes place interrupt, if subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation, if described terminal residential quarter needs terminal compensation, described information analysis module sends the compensation request to the compensation proposition module;

The compensation proposition module, be used for after receiving described compensation request, carry out areal coverage and cover overlapping optimization at described interruption residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme, described prioritization scheme is stored to information storage module, and sends the request of execution to described scheme Executive Module;

The scheme Executive Module is used for reading the prioritization scheme of described information storage module after receiving described execution request, by described prioritization scheme compensation is interrupted in described interruption residential quarter;

Information storage module is used for the described network information data of storage and described prioritization scheme.

Preferably, described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS.

Preferably, described compensation proposition module arranges majorized function at areal coverage and the overlapping optimization of covering of described interruption residential quarter, and described majorized function is:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function, f _CovBe the coverage rate of described whole regional reference signal, f _OverlapBe the overlapping rate of the covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell.

Preferably, described compensation proposition module is utilized particle swarm optimization algorithm, at each residential quarter position vector and velocity vector are set, bring described position vector and velocity vector into described majorized function and draw optimal value, described position vector and velocity vector are upgraded, be optimized iteration, draw optimal solution set, described optimal solution set is described prioritization scheme.

(3) beneficial effect

Radio Access Network cell outage of the present invention compensation method and system utilize the network of terminal residential quarter peripheral cell, by adopting areal coverage and covering overlapping be optimized of particle swarm optimization algorithm to interrupting the residential quarter, realized interrupting the automatic interruption compensation of residential quarter, improved the speed of interrupting compensation, better reduce to interrupt the performance loss of user in the residential quarter, farthest reduce human intervention to network operation, effectively improved network operation usefulness.

Description of drawings

Fig. 1 is the method step figure of embodiment of the invention Radio Access Network cell outage compensation method;

Fig. 2 is the modular structure figure of Radio Access Network cell outage bucking-out system;

Fig. 3 is the logic diagram of embodiment of the invention Radio Access Network cell outage compensation method;

Fig. 4 is that the compensation method of embodiment of the invention Radio Access Network cell outage utilizes particle swarm optimization algorithm to draw the logic diagram of prioritization scheme;

Fig. 5 is embodiment of the invention Radio Access Network cell outage compensation analogue simulation schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.

The Radio Access Network cell outage compensation method of the embodiment of the invention as shown in Figure 1, the method comprising the steps of:

S1 gathers and the monitoring network information data, judges according to described network information data whether the residential quarter network takes place interrupt, and described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS;

If the S2 subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation;

When S3 need interrupt compensating when described interruption residential quarter, carry out areal coverage and cover overlapping optimization at described terminal residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme;

S4 implements described prioritization scheme, and gathers and the monitoring network information data after optimization is finished.

Judge according to the covering index of network whether needs interrupt compensation in the residential quarter that interruption takes place among the described step S2.Preferably, described Radio Access Network is the LTE network in the urban area circumstance, and described covering index satisfies:

The received power value that subscriber equipment is measured the main plot is greater than-105dBm;

The quality of reception value that subscriber equipment is measured the main plot is greater than-13.8dB.

The signal of the reference signal that subscriber equipment receives and interference and noise ratio are supported minimum modulation coding mode.

Preferably, carry out areal coverage at described terminal residential quarter described in the step S3 and comprise step with the method that covers overlapping optimization:

S311 is that benchmark calculates the reference signal area coverage of the neighbor cell of computing terminal residential quarter respectively with the reference signal, and the reference signal area coverage of described neighbor cell is:

$S\left(p_{\mathrm{RS}}^i\right)=\mathrm{\&pi;}\&CenterDot;{\left(g^{-1}\left({\mathrm{PL}}_{\max }^i\right)\right)}^2$

Wherein,

Be the reference signal area coverage of described neighbor cell,

Be the propagation model of described neighbor cell,

Allow path loss for described neighbor cell is maximum, i ∈ n, n are the number of described neighbor cell;

S312 utilizes the reference signal area coverage of described neighbor cell to obtain the coverage rate of whole regional reference signal, and the coverage rate of described whole regional reference signal is:

$f_{\mathrm{cov}}=100\&CenterDot;\frac{S\left(p_{\mathrm{RS}}^1\right)\&cup;S\left(p_{\mathrm{RS}}^2\right)\&cup;\&CenterDot;\&CenterDot;\&CenterDot;\&cup;S\left(p_{\mathrm{RS}}^n\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _CovBe the coverage rate of described whole regional reference signal, S _TargetTarget coverage zone for n neighbor cell;

S313 utilizes the reference signal area coverage of described neighbor cell to obtain the overlapping rate of covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell, and the overlapping rate of the covering of described whole regional reference signal is:

$f_{\mathrm{overlap}}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\underset{j,k\&Element;n,j,k\&NotEqual;i}{\overset{n}{\mathrm{\&Sigma;}}}S\left(p_{\mathrm{RS}}^i\right)\&cap;S\left(p_{\mathrm{RS}}^j\right)\&cap;S\left(p_{\mathrm{RS}}^k\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _OverlapBe the overlapping rate of the covering of whole regional reference signal.

To areal coverage and overlapping being optimized of covering, its majorized function is S314 simultaneously:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function.

According to coverage rate and the variation that covers overlapping rate, f _TotSpan will between [0,200], change, can see, the increase of coverage rate and cover overlapping rate reduce can cause f _TotIncrease, i.e. f _TotMore big, solution is more excellent.The value of k changes with the variation of coverage rate, when coverage rate less than 90% the time, optimize coverage rate and become main target, therefore very low to covering overlapping attention degree, get 0 this moment, like this raising coverage rate that can be very fast; In the time of between coverage rate is in 90% to 95%, the k value increases gradually along with the increase of coverage rate, and expression increases covering overlapping attention degree along with the increase of coverage rate, progressively optimizes the overlapping rate that covers; When coverage rate greater than 95% the time, k gets maximum all the time.Utilize this formula to find the solution, guaranteed two factors of covering and communication quality simultaneously, and by weight factor k two optimization aim are made balance, realize two processes that target is optimized simultaneously.

Preferably, the method for utilizing particle swarm optimization algorithm to draw prioritization scheme described in the step S3 comprises step:

S321 arranges maximum iteration time, and each neighbor cell arranges position vector and velocity vector, and described position vector is X _i=(x _I1, x _I2..., x _ID), described velocity vector is V _i=(v _I1, v _I2..., v _ID), wherein D is vectorial dimension, and described iterations, each neighbor cell are arranged position vector and velocity vector initialization;

S322 brings described position vector and velocity vector into described majorized function and calculates, and utilizes the optimal solution in the optimal solution set storage iterative process;

The described iterations of S323 adds 1, and described position vector and velocity vector are upgraded

$v_{\mathrm{id}}^{t+1}=\mathrm{\&omega;}\&CenterDot;v_{\mathrm{id}}^t+c_1{r}_1(p_{\mathrm{id}}^t-x_{\mathrm{id}}^t)+c_2{r}_2(p_{\mathrm{gd}}^t-x_{\mathrm{id}}^t)$

$x_{\mathrm{id}}^{t+1}=x_{\mathrm{id}}^t+v_{\mathrm{id}}^{t+1}$

Wherein, t is iterations, c ₁, c ₂Be accelerated factor, r ₁, r ₂Be equally distributed random number in [0,1], d is the dimension in the D dimension, and ω is the inertia weight factor;

If S324 current iteration number of times repeats described step S322-S324 less than described maximum iteration time, otherwise export current optimal solution set, described current optimal solution set is described prioritization scheme.

The prioritization scheme that adopts described particle swarm optimization algorithm to draw has the precision height, restrains advantages such as fast, can solve rapidly because a series of problems of interrupting bringing.

The Radio Access Network cell outage bucking-out system of the embodiment of the invention as shown in Figure 2, this system comprises:

The information monitoring module is used for gathering and the monitoring network information data, and described network information data is stored in the information storage module;

The information analysis module, be used for analyzing stored in the described network information data of information storage module, judge whether the residential quarter network takes place interrupt, if subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation, if described terminal residential quarter needs terminal compensation, described information analysis module sends the compensation request to the compensation proposition module;

The compensation proposition module, be used for after receiving described compensation request, carry out areal coverage and cover overlapping optimization at described interruption residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme, described prioritization scheme is stored to information storage module, and sends the request of execution to described scheme Executive Module;

The scheme Executive Module is used for reading the prioritization scheme of described information storage module after receiving described execution request, by described prioritization scheme compensation is interrupted in described interruption residential quarter;

Information storage module is used for the described network information data of storage and described prioritization scheme.

Preferably, described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS.

Preferably, described compensation proposition module arranges majorized function at areal coverage and the overlapping optimization of covering of described interruption residential quarter, and described majorized function is:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function, f _CovBe the coverage rate of described whole regional reference signal, f _OverlapBe the overlapping rate of the covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell.

Preferably, described compensation proposition module is utilized particle swarm optimization algorithm, at each residential quarter position vector and velocity vector are set, bring described position vector and velocity vector into described majorized function and draw optimal value, described position vector and velocity vector are upgraded, be optimized iteration, draw optimal solution set, described optimal solution set is described prioritization scheme.

Concrete, the logic diagram of embodiment of the invention Radio Access Network cell outage compensation method as shown in Figure 3,

Detection-phase, the information monitoring module is gathered and the monitoring network information data, the described network information data of information analysis module analysis, judge whether the residential quarter interrupts, if network does not take place to interrupt, the information monitoring module continues to gather and the monitoring network information data, interrupts entering the analysis phase if take place;

Analysis phase, the information analysis module is collected relevant information, as network coverage index of this residential quarter etc., judge according to described relevant information whether needs interrupt compensation in this residential quarter, the covering target goals reference value that heterogeneous networks provides is all inequality, at the urban area circumstance in the LTE network, its descending covering target goals reference value need satisfy: Reference Signal Received Power (RSRP) value that subscriber equipment is measured main plot in the reported data is greater than-105dBm, Reference Signal Received Quality (RSRQ) value that subscriber equipment is measured main plot in the reported data is greater than-13.8dB, the signal of the reference signal that subscriber equipment receives and interference and noise ratio (SINR) value is enough to support minimum modulation coding mode (MCS), if this residential quarter does not need to interrupt compensation, then system produces warning and notifies the keeper, if compensation need be interrupted in this residential quarter, enter the planning stage;

Planning stage, planning module carries out areal coverage and covers overlapping optimization at described interruption residential quarter, and utilizes particle swarm optimization algorithm to draw prioritization scheme, enters the execution phase;

Execution phase, the scheme Executive Module is adjusted the reference signal transmitting power according to the compensation scheme that forms, and for the network after the compensation, according to every covering index compensation result is assessed, and produces alarm and notifies the keeper.

In the planning stage, in the LTE system, reference signal is mainly used in channel estimating, can be used as user in the residential quarter and carries out down-run survey, synchronously and the reference symbol of data demodulates.In whole working bandwidth, all antennas all adopt firm power that RS is carried out broadcast transmission, and other signal as SCH, PBCH, PCFICH, PDCCH, PDSCH and PHICH, serves as with reference to carrying out power setting with RS power all.Increase the power (P of RS _RS) can effectively increase covering radius.Based on above reason, the optimization aim of this patent is the reference signal transmitting power of adjacent base station, at first utilize mathematical modeling to determine optimization aim after, utilize particle swarm optimization algorithm to generate compensation scheme fast and carry out, below algorithm is described in detail.

The interruption residential quarter is eNB ₀, n adjacent residential quarter arranged on every side, be expressed as N={eNB ₁, eNB ₂..., eNB _n, its corresponding reference signal transmission power value is by P={p ¹ _RS, p ² _RS..., p ⁿ _RSExpression.Work as eNB ₀Interrupt, need adjust the parameter of n on every side adjacent residential quarter.S (p ⁱ _RS) be and p ⁱ _RSThe area coverage of i relevant base station.

I residential quarter area S (p ⁱ _RS) computational methods: RSRP is the key parameter of estimating descending covering, and the RSRP of Cell Edge User crosses and lowly can't guarantee the edges cover quality objective.Be to guarantee coverage goal, make that γ is the required RSRP minimum of Cell Edge User, then the maximum path loss PL that allows in this residential quarter ⁱ _MaxFor:

${{\mathrm{PL}}^i}_{\max }=p_{\mathrm{RS}}^i-\mathrm{\&gamma;}---\left(1\right)$

In case determined the greatest path loss that allows, the maximum covering radius R of this residential quarter _iCan calculate by following formula [11]:

R _i=g ^-1((PL ⁱ _max-sh_margin)|f,h _BS,h _MS)(2)

In the following formula, sh_margin is shadow fading, and f is system frequency, h _BSBe eNB antenna height, h _MSBe the UE antenna height, the propagation model of function g () for choosing according to environment, as the HATA model, Okumura model etc." | " preceding variable that changes in the continuous time interval that is illustrated in is the fixing centrifugal pump of value afterwards.Obtain the maximum covering radius R of this residential quarter _iAfter, by (1), (2) two formulas, can obtain area coverage S (p ⁱ _RS) and p ⁱ _RSMapping relations:

$S\left(p_{\mathrm{RS}}^i\right)=\mathrm{\&pi;}\&CenterDot;{\left(g^{-1}\left({\mathrm{PL}}_{\max }^i\right)\right)}^2---\left(3\right)$

One of important goal of compensation is the coverage rate that will guarantee whole zone, reduces the appearance that covers the cavity, S as far as possible _TargetBe the target coverage zone of n neighbor cell, the coverage rate that defines whole zone is as follows:

$f_{\mathrm{cov}}=100\&CenterDot;\frac{S\left(p_{\mathrm{RS}}^1\right)\&cup;S\left(p_{\mathrm{RS}}^2\right)\&cup;\&CenterDot;\&CenterDot;\&CenterDot;\&cup;S\left(p_{\mathrm{RS}}^n\right)}{S_{t\arg \mathrm{et}}}---\left(4\right)$

First optimization aim is the maximization areal coverage, is expressed as:

Max(f _cov)(5)

Increase P _RSCan effectively improve coverage rate, cover overlapping appearance but can bring simultaneously, bring problems such as pilot pollution.When being in, the somewhere has three or when serving for it more than three eNB, this zone is and covers overlapping area simultaneously.Calculate for simplifying, the present invention considers triple overlapping at most.It is as follows that definition covers overlapping rate:

$f_{\mathrm{overlap}}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\underset{j,k\&Element;n,j,k\&NotEqual;i}{\overset{n}{\mathrm{\&Sigma;}}}S\left(p_{\mathrm{RS}}^i\right)\&cap;S\left(p_{\mathrm{RS}}^j\right)\&cap;S\left(p_{\mathrm{RS}}^k\right)}{S_{t\arg \mathrm{et}}}---\left(6\right)$

Cover unusual appearance for reducing this zone, second optimization aim is to minimize to cover overlapping appearance, is expressed as:

Min(f _overlap)(7)

According to foregoing, the key problem of algorithm is how simultaneously two targets to be optimized.For addressing this problem, in conjunction with optimization aim (5) and optimization aim (7), the definition majorized function

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}---\left(8\right)$

Wherein

$k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.---\left(9\right)$

According to coverage rate and the variation that covers overlapping rate, f _TotSpan will between [0,200], change, can see, the increase of coverage rate and cover overlapping rate reduce can cause f _TotIncrease, i.e. f _TotMore big, solution is more excellent.The value of k changes with the variation of coverage rate, when coverage rate less than 90% the time, optimize coverage rate and become main target, therefore very low to covering overlapping attention degree, get 0 this moment, like this raising coverage rate that can be very fast; In the time of between coverage rate is in 90% to 95%, the k value increases gradually along with the increase of coverage rate, and expression increases covering overlapping attention degree along with the increase of coverage rate, progressively optimizes the overlapping rate that covers; When coverage rate greater than 95% the time, k gets maximum all the time.Utilize this formula to find the solution, guaranteed two factors of covering and communication quality simultaneously, and by weight factor k two optimization aim are made balance, realize two processes that target is optimized simultaneously.

The target of compensation is to solve a series of problems of bringing owing to interrupting rapidly, because particle swarm optimization algorithm has the precision height, restrains advantages such as fast, we utilize particle swarm optimization algorithm to obtain concrete compensation scheme here.In algorithm, each particle i is included as the position vector X of a D dimension _i=(x _I1, x _I2..., x _ID), represent P _RSValue and velocity vector V _i=(v _I1, v _I2..., v _ID), the each step-length of adjusting of representative.During particle i search solution space, preserve the optimum experience position P that it searches _i=(p _I1, p _I2..., p _ID).When each iteration began, particle was according to self inertia and the optimum experience of experience and colony position P _g=(p _G1, p _G2..., p _GD) adjust the velocity vector of oneself and adjust self-position.In the each circulation of algorithm, each particle is pressed following formula renewal speed and position.

$v_{\mathrm{id}}^{t+1}=\mathrm{\&omega;}\&CenterDot;v_{\mathrm{id}}^t+c_1{r}_1(p_{\mathrm{id}}^t-x_{\mathrm{id}}^t)+c_2{r}_2(p_{\mathrm{gd}}^t-x_{\mathrm{id}}^t)---\left(10\right)$

$x_{\mathrm{id}}^{t+1}=x_{\mathrm{id}}^t+v_{\mathrm{id}}^{t+1}---\left(11\right)$

Wherein, c ₁, c ₂Be accelerated factor; r ₁, r ₂Be equally distributed random number in [0,1], d is the dimension in the D dimension; ω is the inertia weight factor.

The compensation method of embodiment of the invention Radio Access Network cell outage utilizes particle swarm optimization algorithm to draw prioritization scheme as shown in Figure 4;

The compensation proposition module initialization.Set loop iteration number of times T _Max, make cycle counter t=0, population is set, initial position and speed; According to current location, utilize formula (8) and (9) to calculate adaptive value f _Tot, and and P _iRelatively, if X _iP _i, then upgrade P _i=X _iFor each particle i, upgrade individual speed V according to formula (10) _i, upgrade a body position X according to formula (11) _i, cycle counter t=t+1 then with maximum iteration time T _MaxCompare, if t＜T _MaxCarry out iteration, otherwise the output optimal solution set namely obtains the optimal compensation scheme.

The Radio Access Network cell outage bucking-out system of the embodiment of the invention comprises the information monitoring module, the information analysis module, and the compensation proposition module, 5 functional modules of scheme Executive Module and information storage module are formed.Each module concrete function is as follows:

Information monitoring module: be responsible for independently monitoring and gathering the underlying network metamessage, and store related data into information storage module.Monitoring and the network information of gathering comprise mobile subscriber's RSRP and RSRQ, the traffic load of eNodeB, and user's COS etc., be information analysis module monitors and the required data of collection.

Information analysis module: by the net element information in the analytical information memory module, judge whether the condition that cell outage takes place satisfies.Be judged as interruption when having taken place, sending trigger request to the compensation proposition module.

The compensation proposition module: after receiving compensation request, the data by in the analytical information memory module independently generate compensation scheme, and store scheme into information storage module, ask the scheme Executive Module to carry out compensation scheme afterwards.

Scheme Executive Module: after receiving the strategy execution request, at first the state information with current network is deposited into information storage module, read related data from information storage module afterwards, independently the relevant parameter of corresponding eNodeB is adjusted, and after scheme is finished, continue acquisition network element information, judge whether compensation result satisfies the covering requirement.

Information storage module: be connected with other four modules, provide the center as data, store dynamic network monitor information, network status data, relevant informations such as cell outage compensation scheme.And information standardized input and output to guarantee the efficiently and accurately operation of each functions of modules.

In emulation testing, simulated environment is that the urban environment in the TD-LTE network is carried out emulation, emulation scope 4.5km * 4.5km, and whole area distribution 7 eNodeB, and spacing 300m does not wait to 500m.200 subscriber equipmenies of random distribution in the zone.The coverage that increases adjacent residential quarter by the adjusting to PRS in the emulation compensates interrupting the residential quarter.Other major parameter is as shown in table 1.Fig. 5 has provided base station and user's distribution situation intuitively, and carries out the result who obtains behind the backoff algorithm.

Table 1: simulation parameter

Among Fig. 5, the circumferential area of dotted line is the base station range schematic diagram under the normal condition, from a certain moment, is positioned at the eNB of central area ₀Interrupt, caused covering the generation in cavity.After adjusting according to the final adjustment scheme that obtains, solid line circle is for carrying out the covering schematic diagram behind the backoff algorithm.By the P to adjacent base station _RSAdjust, the coverage rate of last this area can reach 98.5%, and covering overlapping rate is 1.6%, in existing network, can think that coverage rate reaches at 98% o'clock and namely realizes effective covering, so simulation result has reached the target reference value of coverage rate.

Radio Access Network cell outage of the present invention compensation method and system utilize the network of terminal residential quarter peripheral cell, by adopting areal coverage and covering overlapping be optimized of particle swarm optimization algorithm to interrupting the residential quarter, realized interrupting the automatic interruption compensation of residential quarter, improved the speed of interrupting compensation, better reduce to interrupt the performance loss of user in the residential quarter, farthest reduce human intervention to network operation, effectively improved network operation usefulness.

Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. Radio Access Network cell outage compensation method is characterized in that the method comprising the steps of:

S1 gathers and the monitoring network information data, judges according to described network information data whether the residential quarter network takes place interrupt;

If the S2 subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation;

When S3 need interrupt compensating when described interruption residential quarter, carry out areal coverage and cover overlapping optimization at described terminal residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme;

S4 implements described prioritization scheme, and gathers and the monitoring network information data after optimization is finished.

2. Radio Access Network cell outage as claimed in claim 1 compensation method is characterized in that, described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS.

3. Radio Access Network cell outage as claimed in claim 1 compensation method is characterized in that, judges according to the covering index of network whether needs interrupt compensation in the residential quarter that interruption takes place among the described step S2.

4. Radio Access Network cell outage as claimed in claim 3 compensation method is characterized in that, described Radio Access Network is the LTE network in the urban area circumstance, and described covering index satisfies:

The received power value that subscriber equipment is measured the main plot is greater than-105dBm;

The quality of reception value that subscriber equipment is measured the main plot is greater than-13.8dB.

The signal of the reference signal that subscriber equipment receives and interference and noise ratio are supported minimum modulation coding mode.

5. Radio Access Network cell outage as claimed in claim 1 compensation method is characterized in that, carries out areal coverage at described terminal residential quarter described in the step S3 and comprises step with the method that covers overlapping optimization:

S311 is that benchmark calculates the reference signal area coverage of the neighbor cell of computing terminal residential quarter respectively with the reference signal, and the reference signal area coverage of described neighbor cell is:

$S\left(p_{\mathrm{RS}}^i\right)=\mathrm{\&pi;}\&CenterDot;{\left(g^{-1}\left({\mathrm{PL}}_{\max }^i\right)\right)}^2$

Wherein,

Be the reference signal area coverage of described neighbor cell,

Be the propagation model of described neighbor cell,

Allow path loss for described neighbor cell is maximum, i ∈ n, n are the number of described neighbor cell;

S312 utilizes the reference signal area coverage of described neighbor cell to obtain the coverage rate of whole regional reference signal, and the coverage rate of described whole regional reference signal is:

$f_{\mathrm{cov}}=100\&CenterDot;\frac{S\left(p_{\mathrm{RS}}^1\right)\&cup;S\left(p_{\mathrm{RS}}^2\right)\&cup;\&CenterDot;\&CenterDot;\&CenterDot;\&cup;S\left(p_{\mathrm{RS}}^n\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _CovBe the coverage rate of described whole regional reference signal, S _TargetTarget coverage zone for n neighbor cell;

S313 utilizes the reference signal area coverage of described neighbor cell to obtain the overlapping rate of covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell, and the overlapping rate of the covering of described whole regional reference signal is:

$f_{\mathrm{overlap}}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\underset{j,k\&Element;n,j,k\&NotEqual;i}{\overset{n}{\mathrm{\&Sigma;}}}S\left(p_{\mathrm{RS}}^i\right)\&cap;S\left(p_{\mathrm{RS}}^j\right)\&cap;S\left(p_{\mathrm{RS}}^k\right)}{S_{t\arg \mathrm{et}}}$

Wherein, f _OverlapBe the overlapping rate of the covering of whole regional reference signal.

To areal coverage and overlapping being optimized of covering, its majorized function is S314 simultaneously:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function.

6. Radio Access Network cell outage as claimed in claim 5 compensation method is characterized in that, the method for utilizing particle swarm optimization algorithm to draw prioritization scheme described in the step S3 comprises step:

S321 arranges maximum iteration time, and each neighbor cell arranges position vector and velocity vector, and described position vector is X _i=(x _I1, x _I2..., x _ID), described velocity vector is V _i=(v _I1, v _I2..., v _ID), wherein D is vectorial dimension, and described iterations, each neighbor cell are arranged position vector and velocity vector initialization;

S322 brings described position vector and velocity vector into described majorized function and calculates, and utilizes the optimal solution in the optimal solution set storage iterative process;

The described iterations of S323 adds 1, and described position vector and velocity vector are upgraded

$v_{\mathrm{id}}^{t+1}=\mathrm{\&omega;}\&CenterDot;v_{\mathrm{id}}^t+c_1{r}_1(p_{\mathrm{id}}^t-x_{\mathrm{id}}^t)+c_2{r}_2(p_{\mathrm{gd}}^t-x_{\mathrm{id}}^t)$

$x_{\mathrm{id}}^{t+1}=x_{\mathrm{id}}^t+v_{\mathrm{id}}^{t+1}$

Wherein, t is iterations, c ₁, c ₂Be accelerated factor, r ₁, r ₂Be equally distributed random number in [0,1], d is the dimension in the D dimension, and ω is the inertia weight factor;

If S324 current iteration number of times repeats described step S322-S324 less than described maximum iteration time, otherwise export current optimal solution set, described current optimal solution set is described prioritization scheme.

7. Radio Access Network cell outage bucking-out system is characterized in that this system comprises:

The information monitoring module is used for gathering and the monitoring network information data, and described network information data is stored in the information storage module;

The information analysis module, be used for analyzing stored in the described network information data of information storage module, judge whether the residential quarter network takes place interrupt, if subzone network interrupts, judge whether interrupt the residential quarter needs to interrupt compensation, if described terminal residential quarter needs terminal compensation, described information analysis module sends the compensation request to the compensation proposition module;

The compensation proposition module, be used for after receiving described compensation request, carry out areal coverage and cover overlapping optimization at described interruption residential quarter, and utilize particle swarm optimization algorithm to draw prioritization scheme, described prioritization scheme is stored to information storage module, and sends the request of execution to described scheme Executive Module;

The scheme Executive Module is used for reading the prioritization scheme of described information storage module after receiving described execution request, by described prioritization scheme compensation is interrupted in described interruption residential quarter;

Information storage module is used for the described network information data of storage and described prioritization scheme.

8. Radio Access Network cell outage bucking-out system as claimed in claim 7 is characterized in that, described network information data comprise mobile subscriber's received power, the quality of reception, the traffic load of residential quarter and user's COS.

9. Radio Access Network cell outage bucking-out system as claimed in claim 7 is characterized in that, described compensation proposition module arranges majorized function at areal coverage and the overlapping optimization of covering of described interruption residential quarter, and described majorized function is:

$f_{\mathrm{tot}}=f_{\mathrm{cov}}+k\left(f_{\mathrm{cov}}\right)\&CenterDot;\frac{1}{1+f_{\mathrm{overlap}}}$

Wherein, $k\left(f_{\mathrm{cov}}\right)\text{=}\left\{\begin{array}{cc}0,& f_{\mathrm{cov}}<90\\ 100\&CenterDot;{\left(\frac{f_{\mathrm{cov}}-90}{5}\right)}^2,& 90\&le;f_{\mathrm{cov}}<95\\ 100,& \mathrm{else}\end{array}\right.,$ f _TotBe described majorized function, f _CovBe the coverage rate of described whole regional reference signal, f _OverlapBe the overlapping rate of the covering of whole regional reference signal, described whole zone comprises the reference signal overlay area of described interruption residential quarter and described neighbor cell.

10. Radio Access Network cell outage bucking-out system as claimed in claim 9, it is characterized in that, described compensation proposition module is utilized particle swarm optimization algorithm, at each residential quarter position vector and velocity vector are set, bring described position vector and velocity vector into described majorized function and draw optimal value, described position vector and velocity vector are upgraded, be optimized iteration, draw optimal solution set, described optimal solution set is described prioritization scheme.

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