CN104519540A - Handover decision method, handover decision device and network-side equipment - Google Patents

Abstract

An embodiment of the invention provides a handover decision method, a handover decision device and network-side equipment. The handover decision method includes: acquiring serving cell signal intensity predictive values and neighboring cell signal intensity predictive values, corresponding to multiple follow-up time points, of a mobile terminal; according to the serving cell signal intensity predictive values and the neighboring cell signal intensity predictive values, selecting a first time point from the multiple follow-up time points, wherein a difference of the serving cell signal intensity predictive value and the neighboring cell signal intensity predictive value, which correspond to the first time point, of the mobile terminal is larger than a preset signal intensity threshold value; judging whether a delay time, relative to a current time point, of the first time point is smaller than a preset time threshold value to acquire a judging result, wherein the preset time threshold value is not larger than handoff delay of the mobile terminal; if yes, initiating a handover command to the mobile terminal. By the handover decision method, the handover decision device and the network-side equipment, handover success possibility of the mobile terminal in a high-speed mobile environment is increased.

Description

A kind of switch determining method, device and network equipment

Technical field

The present invention relates to wireless domain, particularly relate to a kind of switch determining method, device and network equipment.

Background technology

The changing method that what current mobile communication system generally adopted is based on signal strength signal intensity is also a kind of basic switch determining method.The general principle of this switch determining method is: in M the measurement report that mobile terminal (as mobile phone) reports, if wherein N(N is the value being less than or equal to M, be configured by network parameter) in individual measurement report, when reporting that the signal strength signal intensity of certain neighbor cell is all greater than current service cell, then initiate to switch.

Because mobile terminal may in the overlapping covered state remaining static or move around, therefore also introduce this parameter of HO hysteresis (a kind of signal strength amount) in mobile communication system and avoid pingpang handoff, only have when the signal strength signal intensity of neighbor cell in a period of time be greater than the signal strength signal intensity of Serving cell and HO hysteresis and time, just initiate to switch.

But, there is such problem in this changing method based on signal strength signal intensity: in high-speed mobile environment, if by judging multiple measurement report to switch within a period of time, just can initiate to switch when may receive first measurement report wherein, but because will wait for that subsequent measurement reliably is adjudicated and miss an opportunity because of a delay, and mobile terminal is quickly mobile in high-speed mobile environment, thus probably just arrive edge, Serving cell soon when starting to perform and switching, and not yet complete to switch and just move out Serving cell, and cause handoff failure.

Summary of the invention

In view of this, the object of the embodiment of the present invention is to provide a kind of switch determining method, device and network equipment, to improve the possibility of mobile terminal handover success in high-speed mobile environment.

For solving the problems of the technologies described above, the embodiment of the present invention provides scheme as follows:

The embodiment of the present invention provides a kind of switch determining method, comprising:

Obtain mobile terminal and distinguish corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value at follow-up multiple time point;

According to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Judge that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

When described judged result is for being, initiate switching command to mobile terminal.

Preferably, described acquisition mobile terminal comprises in the corresponding respectively serving cell signal prediction of strength value of follow-up multiple time point and adjacent cell signal strength signal intensity predicted value:

According to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

Preferably, described serving cell signal intensity according to repeatedly reporting before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value comprises:

According to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first anticipation function of serving cell signal intensity;

According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generate time dependent second anticipation function of adjacent cell signal strength signal intensity;

To each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

Preferably, described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first anticipation function and described second anticipation function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first anticipation function of serving cell signal intensity; According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, the step generating time dependent second anticipation function of adjacent cell signal strength signal intensity comprises:

According to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generate the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

According to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

By all described second vectors of described first vector, sort according to the time order and function order of each self-corresponding time point, obtain the vector sequence after sorting;

When all coefficient the unknowns of described polynomial function, calculate described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding;

Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k;

Solve described k rank equation group, obtain described all coefficients;

According to described all coefficients, generate described polynomial function;

Described to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in the step of adjacent cell signal strength signal intensity predicted value corresponding to described each time point, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

Preferably, described according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select the very first time to put comprise:

According to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

The embodiment of the present invention also provides a kind of switch decision device, comprising:

Acquisition module, distinguishes corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value for obtaining mobile terminal at follow-up multiple time point;

Select module, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Judge module, for judging that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

Initiation module, for when described judged result is for being, initiates switching command to mobile terminal.

Preferably, described acquisition module comprises:

Generate submodule, for according to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

Preferably, described generation submodule comprises:

First generation unit, for according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generates time dependent first anticipation function of serving cell signal intensity;

Second generation unit, for according to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generates time dependent second anticipation function of adjacent cell signal strength signal intensity;

Determining unit, for to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

Preferably, described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first anticipation function and described second anticipation function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described first generation unit; Second generation unit comprises:

First generates subelement, for according to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generates the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

Second generates subelement, for according to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

Sequence subelement, for by all described second vectors of described first vector, sorts according to the time order and function order of each self-corresponding time point, obtains the vector sequence after sorting;

3rd generates subelement, for when all coefficient the unknowns of described polynomial function, calculates described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding; Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k; Solve described k rank equation group, obtain described all coefficients; According to described all coefficients, generate described polynomial function;

In described determining unit, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

Preferably, described selection module comprises:

Chooser module, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

The embodiment of the present invention also provides a kind of network equipment comprising above-described switch decision device.

As can be seen from the above, the embodiment of the present invention at least has following beneficial effect:

In high-speed mobile environment, mobile terminal just started to perform switching before the corresponding adjacent cell signal strength signal intensity of prediction and the difference of serving cell signal intensity are greater than the time point of preset signal strength threshold value, compared with needing the adjacent cell signal strength signal intensity that obtains in actual measurement and the difference of serving cell signal intensity to be greater than could to start after certain signal strength threshold value to perform switching with mobile terminal under existing handover decision mechanism, start to perform the time point switched to shift to an earlier date, again because this time point to be less than the handover delay of mobile terminal relative to the time of delay of current point in time, thus mobile terminal shortly can complete switching after arriving this time point, thus improve the possibility of mobile terminal handover success.

Accompanying drawing explanation

Fig. 1 represents the flow chart of steps of a kind of switch determining method that the embodiment of the present invention provides;

Fig. 2 represents the flow chart of steps of the switch determining method based on vector mapping of the better embodiment of the embodiment of the present invention;

Fig. 3 represents that the revised polynomial prediction opisometer that utilizes of the better embodiment of the embodiment of the present invention calculates the detailed process schematic diagram of the reasonable time point that travelling carriage startup switches;

Fig. 4 represents the structural representation of a kind of switch decision device that the embodiment of the present invention provides.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawings and the specific embodiments the embodiment of the present invention is described in detail.

Fig. 1 represents the flow chart of steps of a kind of switch determining method that the embodiment of the present invention provides, and with reference to Fig. 1, the embodiment of the present invention provides a kind of switch determining method, comprises the steps:

Step 101, obtains mobile terminal and distinguishes corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value at follow-up multiple time point;

Step 102, according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Step 103, judge that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

Step 104, when described judged result is for being, initiates switching command to mobile terminal.

Visible, by the way, in high-speed mobile environment, mobile terminal just started to perform switching before the corresponding adjacent cell signal strength signal intensity of prediction and the difference of serving cell signal intensity are greater than the time point of preset signal strength threshold value, compared with needing the adjacent cell signal strength signal intensity that obtains in actual measurement and the difference of serving cell signal intensity to be greater than could to start after certain signal strength threshold value to perform switching with mobile terminal under existing handover decision mechanism, start to perform the time point switched to shift to an earlier date, again because this time point to be less than the handover delay of mobile terminal relative to the time of delay of current point in time, thus mobile terminal shortly can complete switching after arriving this time point, thus improve the possibility of mobile terminal handover success.

Wherein, described preset signal strength threshold value such as: 0, HO hysteresis etc., specifically can set according to network actual state.

In embodiments of the present invention, described acquisition mobile terminal can comprise in the corresponding respectively serving cell signal prediction of strength value of follow-up multiple time point and adjacent cell signal strength signal intensity predicted value:

According to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

Wherein, described serving cell signal intensity according to repeatedly reporting before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value can comprise:

According to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first anticipation function of serving cell signal intensity;

According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generate time dependent second anticipation function of adjacent cell signal strength signal intensity;

To each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

Here, described first anticipation function and described second anticipation function can be different, in this case, prediction to serving cell signal intensity and the prediction to adjacent cell signal strength signal intensity are carried out respectively, and predicting the outcome may be not accurate enough, in view of this, serving cell signal intensity and adjacent cell signal strength signal intensity can be considered as vector to generate a unified anticipation function, with improve prediction accuracy, below for this anticipation function for polynomial function, be described:

Described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first function and described second function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first function of serving cell signal intensity; According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, the step generating time dependent second function of adjacent cell signal strength signal intensity comprises:

According to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generate the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

According to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

By all described second vectors of described first vector, sort according to the time order and function order of each self-corresponding time point, obtain the vector sequence after sorting;

When all coefficient the unknowns of described polynomial function, calculate described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding;

Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k;

Solve described k rank equation group, obtain described all coefficients;

According to described all coefficients, generate described polynomial function;

Described to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second function for described each time point as mobile terminal in the step of adjacent cell signal strength signal intensity predicted value corresponding to described each time point, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

Certainly, those skilled in the art also should be understood that and replace polynomial function to predict signal strength signal intensity with other anticipation function existing, are also all fine.

In embodiments of the present invention, described according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select the very first time to put can comprise:

According to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

Wherein, described all time points are only included to the situation of a time point, then this time point is exactly point of the described very first time.

For the embodiment of the present invention being set forth clearly clear, provide the better embodiment of the embodiment of the present invention below.

With reference to Fig. 2, this better embodiment provides the switch determining method mapped based on vector, and its specific implementation process comprises: the measurement data first gathering mobile terminal, the laggard row data analysis of screening valid data.The current received signal strength of the Serving cell and adjacent cell received signal strength and terminal of getting terminal in historical record is in the lump as calculating sample value, build signal phasor in given individual sample value and be mapped in two-dimensional space, utilize variable local derviation to obtain the k rank equation group of signal phasor, then use Doolittle triangle decomposition obtain the polynomial curve expression formula of signal phasor and revise.Then utilize revised signal phasor expression formula to calculate mobile terminal and arrive the time interval switched needed for band from current location, handover delay according to the described time interval and mobile terminal calculates the reasonable time point that mobile terminal starts switching, when arriving reasonable time point, switching command is initiated to mobile terminal, to ensure that mobile terminal had enough time to start in time and switches and complete handoff procedure smoothly before leaving switching band.This method can reduce the handover delay of mobile terminal, makes mobile terminal can complete switching in time, is conducive to the handover success rate improving mobile terminal in high-speed mobile environment.

Particularly, first carry out record with the time interval of Δ t to end message, the information of mobile terminal comprises terminal at current time T _jreceive the signal strength signal intensity X of current network service community _jand the signal strength signal intensity Y of adjacent cell _j, before getting in historical record, the Serving cell of n moment terminal and the current received signal strength of adjacent cell received signal strength and terminal are in the lump as calculating sample value, and n is that numerical value chosen by default sample; Terminal received signals intensity (comprising Serving cell and adjacent cell) is built signal phasor and is mapped in two-dimensional space, n+1 then given sample value is decomposed in x(serving cell signal intensity with vector form), y(adjacent cell signal strength signal intensity) coordinate on axle represents and is shown below:

$\{\stackrel{\→}{S_{j-n}},\stackrel{\→}{S_{j-n+1}},\·\·\·\stackrel{\→}{S_j}\}=\{(\stackrel{\→}{S_{j-n,x}},\stackrel{\→}{S_{j-n,y}}),(\stackrel{\→}{S_{j-n+1,x}},\stackrel{\→}{S_{j-n+1,y}}),\·\·\·(\stackrel{\→}{S_{j,x}},\stackrel{\→}{S_{j,y}})\}$

Set up the version of polynomial repressentation terminal signaling vector, then n+1 sample value substitution can be calculated polynomial each term coefficient.First multinomial is used represent that terminal is at T _j-nmoment is to T _jthe function of change in the time period in moment, uses following formula to represent:

$\stackrel{\&RightArrow;}{S_{j\left(i\right)}}=\stackrel{\&RightArrow;}{a_0}+\stackrel{\&RightArrow;}{a_1}i+\stackrel{\&RightArrow;}{a_2}{i}^2\&CenterDot;\&CenterDot;\&CenterDot;+\stackrel{\&RightArrow;}{a_k}{i}^k,(k<n,j-n\&le;i\&le;j)$

If T _irepresent the moment of i-th sample point, and T _j-n≤ Ti≤T _j, now the sample value of mobile terminal received signal strength is then predict that the error A of ordered series of numbers and sample value can represent with following formula:

$A=\underset{i=j-n}{\overset{j-1}{\mathrm{\&Sigma;}}}{[\stackrel{\&RightArrow;}{S_i}-(\stackrel{\&RightArrow;}{a_0}+\stackrel{\&RightArrow;}{a_1}i+\stackrel{\&RightArrow;}{a_2}{i}^2\&CenterDot;\&CenterDot;\&CenterDot;+\stackrel{\&RightArrow;}{a_k}{i}^k)]}^2$

For obtaining coefficient sets in above-mentioned formula can be by be considered as a variable respectively, when error A is minimum value, A can be made each variable partial derivative be zero, then can obtain k rank equation group, be shown below:

$\left\{\begin{array}{c}\stackrel{\&RightArrow;}{a_0}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^0\right)+\stackrel{\&RightArrow;}{a_1}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1\right)+\&CenterDot;\&CenterDot;\&CenterDot;+\stackrel{\&RightArrow;}{a_k}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^0\stackrel{\&RightArrow;}{S_i}\\ \stackrel{\&RightArrow;}{a_0}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1\right)+\stackrel{\&RightArrow;}{a_1}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^2\right)+\&CenterDot;\&CenterDot;\&CenterDot;+\stackrel{\&RightArrow;}{a_k}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{k+1}\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1\stackrel{\&RightArrow;}{S_i}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \stackrel{\&RightArrow;}{a_0}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k\right)+\stackrel{\&RightArrow;}{a_1}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{k+1}\right)+\&CenterDot;\&CenterDot;\&CenterDot;+\stackrel{\&RightArrow;}{a_k}\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{2k}\right)=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k\stackrel{\&RightArrow;}{S_i}\end{array}\right.$

Write above-mentioned k rank equation group as matrix form, order:

$A^{\&prime;}=\left(\begin{array}{cccc}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^0& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1& \&CenterDot;\&CenterDot;\&CenterDot;& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k\\ \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^2& \&CenterDot;\&CenterDot;\&CenterDot;& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{k+1}\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ \&CenterDot;& \&CenterDot;& \&CenterDot;& \&CenterDot;\\ \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{k+1}& \&CenterDot;\&CenterDot;\&CenterDot;& \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^{2k}\end{array}\right)$

x＝(a ₀,a ₁…a _k)

$b=\left(\begin{array}{c}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^0\stackrel{\&RightArrow;}{S_i}\\ \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^1\stackrel{\&RightArrow;}{S_1}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ \underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{i}^k\stackrel{\&RightArrow;}{S_i}\end{array}\right)$

Then above-mentioned k rank equation group can be expressed as A'x=b, utilize Doolittle point of stem-butts cutting off matrix A ' write as the form of following two matrix multiples:

A'＝LU

Wherein L is lower triangular matrix, and U is upper triangular matrix.System of linear equations A'x=b can be write as A'x=(LU) x=L (Ux)=b like this, make Ux=y, then former system of linear equations A'=LU turns to two simple trigonometric equation group: Ux=y and Ly=b.So Ly=b first can be solved obtain vectorial y, then solve Ux=y, thus reach the object solving system of linear equations A'x=b.

If matrix A ' Doolittle be decomposed into:

For obtaining matrix L and U, according to matrix multiplication rule, have:

$L_i{U}_j=(l_{i1},l_{i2},l_{i3},\&CenterDot;\&CenterDot;\&CenterDot;l_{\mathrm{ii}-1},\mathrm{1,0},\&CenterDot;\&CenterDot;\&CenterDot;,0)\left(\begin{array}{c}{u}_{1j}\\ u_{2j}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ u_{\mathrm{jj}}\\ 0\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ 0\end{array}\right)=a_{\mathrm{ij}}$

Be converted into formula, be shown below:

$a_{\mathrm{ij}}=\underset{p=1}{\overset{n}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{\mathrm{pj}}=\underset{p=1}{\overset{\min \{i,j\}}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{\mathrm{pj}}$

According to matrix multiplication and equal definition, have:

$a_{1j}=\underset{p=1}{\overset{n}{\mathrm{\&Sigma;}}}{l}_{1p}\&CenterDot;u_{\mathrm{pj}}=\underset{p=1}{\overset{1}{\mathrm{\&Sigma;}}}{l}_{1p}\&CenterDot;u_{\mathrm{pj}}=l_{11}\&CenterDot;u_{1j}=u_{1j},j=\mathrm{1,2},\&CenterDot;\&CenterDot;\&CenterDot;,n$

$a_{i1}=\underset{p=1}{\overset{n}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{p1}=\underset{p=1}{\overset{1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{p1}=l_{i1}\&CenterDot;u_{11},i=\mathrm{2,3},\&CenterDot;\&CenterDot;\&CenterDot;,n$

Obtain formula:

u _1j＝a _1jj＝1,2,…,n

l _i1＝a _i1/u ₁₁j＝2,3,…,n

As i≤j, can obtain:

$a_{\mathrm{ij}}=\underset{p=1}{\overset{n}{\mathrm{\&Sigma;}}}{l}_{1p}\&CenterDot;u_{\mathrm{pj}}=\underset{p=1}{\overset{i}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{\mathrm{pj}}=\underset{p=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{\mathrm{pj}}+u_{\mathrm{ij}}$

$a_{\mathrm{ji}}=\underset{p=1}{\overset{n}{\mathrm{\&Sigma;}}}{l}_{\mathrm{jp}}\&CenterDot;u_{\mathrm{pi}}=\underset{p=1}{\overset{i}{\mathrm{\&Sigma;}}}{l}_{\mathrm{jp}}\&CenterDot;u_{\mathrm{pi}}=\underset{p=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{jp}}\&CenterDot;u_{\mathrm{pi}}+l_{\mathrm{ji}}{u}_{\mathrm{ii}}$

Doolittle decomposition formula can be obtained according to above formula:

$u_{\mathrm{ij}}=a_{\mathrm{ij}}-\underset{p=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{ip}}\&CenterDot;u_{\mathrm{pj}},j\&GreaterEqual;i$

$l_{\mathrm{ji}}=(a_{\mathrm{ji}}-\underset{p=1}{\overset{i-1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{jp}}\&CenterDot;u_{\mathrm{pi}})/u_{\mathrm{ii}},j>i$

When coefficient matrices A ' complete A'=LU decompose after, equation group A'x=b just turns to A'x=(LU) x=L (Ux)=b, and be equivalent to and solve two equation group Ly=b and Ux=y, specific formula for calculation is:

$\left\{\begin{array}{c}{y}_1=b_1\\ y_p=b_p-\underset{j-1}{\overset{p-1}{\mathrm{\&Sigma;}}}{l}_{\mathrm{pj}}\&CenterDot;y_j\end{array}\right.,(p=\mathrm{2,3},\&CenterDot;\&CenterDot;\&CenterDot;,n)$

$\left\{\begin{array}{c}{x}_n=y_n/u_{\mathrm{nn}}\\ x_p=(y_p-\underset{j=p+1}{\overset{n}{\mathrm{\&Sigma;}}}{u}_{\mathrm{pj}}\&CenterDot;x_j)/u_{\mathrm{pp}}\end{array}\right.,(p=n-1,n-2,\&CenterDot;\&CenterDot;\&CenterDot;,1)$

Coefficient sets is solved by Doolittle decomposition method value after, substituted into in, the polynomial expression formula of signal receiving strength can be obtained according to expression formula variation tendency, computing terminal is at T _j+1the received signal strength in moment, is shown below:

S _j+1＝S _j(j+1)

Then to gained signal phasor multinomial revise, be described as follows:

for the terminal signaling vector sample point of reality, represent that before revising, terminal is at T _j+1time-ofday signals accepts the predicted value of intensity, is namely by signal phasor multinomial the signal phasor calculated, represent that after revising, terminal is at T _j+1the predicted value of time-ofday signals vector, represent the error amount revised, represent T _ithe actual signal vector sample value in moment, order

$\mathrm{\&Delta;}\stackrel{\&RightArrow;}{S_i}=\stackrel{\&RightArrow;}{S_{j\left(i\right)}}-\stackrel{\&RightArrow;}{S_i},(j-n\&le;i\&le;j-1)$ (formula 1)

Then revised sample value can be obtained by following formula:

$\stackrel{\&RightArrow;}{{S^{\&prime;}}_i}=\stackrel{\&RightArrow;}{S_i}-\mathrm{\&Delta;}\stackrel{\&RightArrow;}{S_i}$

In above formula, S' _irepresent T _ithe correction value of moment terminal signaling vector real sample values, Δ S _irepresent T _ithe predicted value of moment terminal signaling vector and the error amount of real sample values.

Will replace in sample form new sample, obtain new k rank equation group according to above method and utilize Doolittle decomposition method to solve coefficient sets then substituting into, just can obtain revised polynomial prediction curve

Obtain the polynomial prediction curve of signal phasor after, can calculate the level difference of follow-up adjacent cell and Serving cell, the level difference that can obtain adjacent cell and Serving cell reaches the time point of switching condition.With reference to Fig. 3, detailed process is as follows:

According to revised multinomial numerical curve calculate with current point in time the received signal strength value on follow-up m the time point being starting point, can be designated as then meet the threshold value R of switching condition according to the adjacent cell preset and the level difference of Serving cell, meet the threshold value R of switching condition according to the level difference of adjacent cell and Serving cell, at T _j+1, T _j+2... T _j+mthe time point t that middle searching satisfies condition:

$\stackrel{\&RightArrow;}{{S^{\&prime;}}_{j\left(t\right),y}}-\stackrel{\&RightArrow;}{{S^{\&prime;}}_{j\left(t\right),x}}\&GreaterEqual;R$

If do not exist, then continue to find the time point satisfied condition according to the method described above at next one statistics point.If exist, then calculate the shortest time interval delta T (if there is multiple time point satisfied condition) of predicted time point and the current point in time satisfied condition, judge whether Δ T meets switching criterion requirement.Wherein, next statistics point refers to the time point receiving the new measurement report of mobile terminal, upgrades vector expression according to the method described above according to up-to-date sample point.

If Δ T does not meet switching criterion requirement, then continue to find the time point satisfied condition according to the method described above at next one statistics point and also continue to judge whether Δ T meets switching criterion requirement.

If whether Δ T meets switching criterion requirement, then start switching command.

Described switching criterion requirement, refer to that mobile terminal arrives the difference DELTA T switching time point (level difference of adjacent cell and Serving cell meets the time point of switching threshold R) and the current point in time be with and is less than default time interval thresholding (handoff threshold) Time_threshold, that is:

ΔT＜Time_threshold

Wherein, Time_threshold refers to the handover delay of mobile terminal.

Those skilled in the art also should be clear, more accurate when being to calculate follow-up signal estimation value to multinomial correction, the error that reduction may exist, certainly, uses the multinomial before revising to calculate follow-up signal estimation value and is also fine.

Changing method based on signal strength signal intensity is adapted at using in common scenarios, but, consider the feature of mobile terminal in high-speed mobile environment, if or by judging multiple measurement report to switch within a period of time, possible mobile terminal moves out Serving cell when not yet completing switching, and causes dropped calls.In the mobile communication system in the regions such as highway, high-speed railway, city expressway, it linearly covers, the feature of fast moving and single-way moving, control mobile terminal according to the current switch determining method based on signal strength signal intensity and perform switching, the problem as above analyzed can be there is, easily cause mobile terminal handoff failure.If but adjustment parameter, only switch according to a small amount of measurement report, the mobile terminal of movement at a slow speed may being caused again when conversing, producing pingpang handoff, affecting communication effect.Also namely, the changing method based on decision signal intensity generally used in mobile communication system is unsuitable for using in the scene of mobile terminal high-speed mobile.

Mobile terminal for fast moving adopts the problem easily causing handoff failure during the changing method based on signal strength signal intensity, the switch determining method based on vector mapping that this better embodiment proposes can reduce the handover delay of mobile terminal, make mobile terminal can complete switching in time, be conducive to the handover success rate under raising mobile terminal high-speed mobile.

This better embodiment builds signal phasor according to given sample value and is mapped in two-dimensional space, utilize variable local derviation to obtain the k rank equation group of signal phasor, then use Doolittle triangle decomposition obtain the polynomial curve expression formula of signal phasor and revise.Then utilize revised signal phasor expression formula to calculate mobile terminal and arrive the time interval switched needed for band from current location, then calculate according to the handover delay of the described time interval and mobile terminal the reasonable time point that mobile terminal starts switching, and startup switches when mobile terminal arrives reasonable time point.The handover delay of mobile terminal in high-speed mobile situation can be shortened, ensure that mobile terminal switches at rational time point, the switching demand of mobile terminal in high-speed mobile situation can be met.Make mobile terminal can fast and correctly start switching, make fast moving mobile communication terminal can fast, efficiently, reliably from a cell merge to another one community, keep Session continuity, be conducive to the handover success rate in raising mobile terminal high-speed mobile situation, final lifting region communication quality.This better embodiment calculates according to the handover delay of the described time interval and mobile terminal the reasonable time point that mobile terminal starts switching, when starting switching when reaching reasonable time point, so can switching time be shortened, the mobile terminal of high-speed mobile can be avoided to miss the reasonable chance of switching, ensure that communication effect, decrease the probability of dropped calls, improve handover success rate.

With reference to Fig. 4, the embodiment of the present invention also provides a kind of switch decision device, comprising:

Acquisition module 401, distinguishes corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value for obtaining mobile terminal at follow-up multiple time point;

Select module 402, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Judge module 403, for judging that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

Initiation module 404, for when described judged result is for being, initiates switching command to mobile terminal.

Visible, by the way, in high-speed mobile environment, mobile terminal just started to perform switching before the corresponding adjacent cell signal strength signal intensity of prediction and the difference of serving cell signal intensity are greater than the time point of preset signal strength threshold value, compared with needing the adjacent cell signal strength signal intensity that obtains in actual measurement and the difference of serving cell signal intensity to be greater than could to start after certain signal strength threshold value to perform switching with mobile terminal under existing handover decision mechanism, start to perform the time point switched to shift to an earlier date, again because this time point to be less than the handover delay of mobile terminal relative to the time of delay of current point in time, thus mobile terminal shortly can complete switching after arriving this time point, thus improve the possibility of mobile terminal handover success.

Wherein, described acquisition module 401 can comprise:

Generate submodule, for according to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

Described generation submodule can comprise:

First generation unit, for according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generates time dependent first anticipation function of serving cell signal intensity;

Second generation unit, for according to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generates time dependent second anticipation function of adjacent cell signal strength signal intensity;

Determining unit, for to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

Particularly, Ke Yiyou:

Described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first anticipation function and described second anticipation function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described first generation unit; Second generation unit comprises:

First generates subelement, for according to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generates the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

Second generates subelement, for according to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

Sequence subelement, for by all described second vectors of described first vector, sorts according to the time order and function order of each self-corresponding time point, obtains the vector sequence after sorting;

3rd generates subelement, for when all coefficient the unknowns of described polynomial function, calculates described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding; Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k; Solve described k rank equation group, obtain described all coefficients; According to described all coefficients, generate described polynomial function;

In described determining unit, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

In addition, described selection module 402 can comprise:

Chooser module, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

The embodiment of the present invention also provides a kind of network equipment, and described network equipment comprises above-described switch decision device.Described network equipment is such as: LTE base station.

The above is only the execution mode of the embodiment of the present invention; should be understood that; for those skilled in the art; under the prerequisite not departing from embodiment of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection range of the embodiment of the present invention.

Claims (11)

1. a switch determining method, is characterized in that, comprising:

Obtain mobile terminal and distinguish corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value at follow-up multiple time point;

According to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Judge that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

When described judged result is for being, initiate switching command to mobile terminal.

2. the method for claim 1, is characterized in that, described acquisition mobile terminal comprises in the corresponding respectively serving cell signal prediction of strength value of follow-up multiple time point and adjacent cell signal strength signal intensity predicted value:

According to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

3. method as claimed in claim 2, it is characterized in that, described serving cell signal intensity according to repeatedly reporting before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value comprises:

According to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first anticipation function of serving cell signal intensity;

According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generate time dependent second anticipation function of adjacent cell signal strength signal intensity;

To each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

4. method as claimed in claim 3, it is characterized in that, described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first anticipation function and described second anticipation function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generate time dependent first anticipation function of serving cell signal intensity; According to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, the step generating time dependent second anticipation function of adjacent cell signal strength signal intensity comprises:

According to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generate the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

According to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

By all described second vectors of described first vector, sort according to the time order and function order of each self-corresponding time point, obtain the vector sequence after sorting;

When all coefficient the unknowns of described polynomial function, calculate described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding;

Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k;

Solve described k rank equation group, obtain described all coefficients;

According to described all coefficients, generate described polynomial function;

Described to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in the step of adjacent cell signal strength signal intensity predicted value corresponding to described each time point, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

5. the method for claim 1, is characterized in that, described according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, selects the very first time to put and comprise from described follow-up multiple time point:

According to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

6. a switch decision device, is characterized in that, comprising:

Acquisition module, distinguishes corresponding serving cell signal prediction of strength value and adjacent cell signal strength signal intensity predicted value for obtaining mobile terminal at follow-up multiple time point;

Select module, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, select very first time point, mobile terminal is greater than preset signal strength threshold value in the described serving cell signal prediction of strength value of very first time point correspondence and the difference of adjacent cell signal strength signal intensity predicted value;

Judge module, for judging that point of the described very first time is relative to whether being less than Preset Time threshold value the time of delay of current point in time, obtain judged result, described Preset Time threshold value is not more than the handover delay of mobile terminal;

Initiation module, for when described judged result is for being, initiates switching command to mobile terminal.

7. device as claimed in claim 6, it is characterized in that, described acquisition module comprises:

Generate submodule, for according to the serving cell signal intensity repeatedly reported before the current first service cell signal strength that reports of mobile terminal and the first adjacent cell signal strength signal intensity and mobile terminal and adjacent cell signal strength signal intensity, generate described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value.

8. device as claimed in claim 7, it is characterized in that, described generation submodule comprises:

First generation unit, for according to described first service cell signal strength and the described serving cell signal intensity repeatedly reported, generates time dependent first anticipation function of serving cell signal intensity;

Second generation unit, for according to described first adjacent cell signal strength signal intensity and the described adjacent cell signal strength signal intensity repeatedly reported, generates time dependent second anticipation function of adjacent cell signal strength signal intensity;

Determining unit, for to each time point in described follow-up multiple time point, using serving cell signal intensity corresponding on described first anticipation function for described each time point as mobile terminal in serving cell signal prediction of strength value corresponding to described each time point, using adjacent cell signal strength signal intensity corresponding on described second anticipation function for described each time point as mobile terminal in adjacent cell signal strength signal intensity predicted value corresponding to described each time point.

9. device as claimed in claim 8, it is characterized in that, described repeatedly in time interval between two time points of twice, described follow-up multiple time point time interval between any two, first time point in described follow-up multiple time point and the time interval between described current point in time and described current point in time and described repeatedly in last time point between the time interval all identical;

Described first anticipation function and described second anticipation function are polynomial function, and the dependent variable of described polynomial function is the vector variable be made up of serving cell signal intensity and adjacent cell signal strength signal intensity;

Described first generation unit; Second generation unit comprises:

First generates subelement, for according to described first service cell signal strength and described first adjacent cell signal strength signal intensity, generates the first vector be made up of described first service cell signal strength and described first adjacent cell signal strength signal intensity;

Second generates subelement, for according to described repeatedly in the serving cell signal intensity that at every turn reports and adjacent cell signal strength signal intensity, generate the second vector be made up of the described serving cell signal intensity that reports and adjacent cell signal strength signal intensity at every turn;

Sequence subelement, for by all described second vectors of described first vector, sorts according to the time order and function order of each self-corresponding time point, obtains the vector sequence after sorting;

3rd generates subelement, for when all coefficient the unknowns of described polynomial function, calculates described vector sequence and the error expression of described polynomial function between the expression formula sequence in the time point sequence that described vector sequence is corresponding; Using the variable of described all coefficients as described error expression, make the variable partial derivative of described error expression to each coefficient in described all coefficients be respectively zero, obtain k rank equation group, wherein, the number of described all coefficients is k; Solve described k rank equation group, obtain described all coefficients; According to described all coefficients, generate described polynomial function;

In described determining unit, for the arbitrary time point in described follow-up multiple time point, mobile terminal obtains in the following way in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value:

Determine the sequence number of described arbitrary time point in the rear in the sequence that forms according to time order and function order of continuous multiple time point;

The independent variable corresponding in described polynomial function by described current point in time and described sequence number sum, as the independent variable that described arbitrary time point is corresponding in described polynomial function;

The independent variable that described arbitrary time point is corresponding in described polynomial function substitutes into described polynomial function, obtains the vector that described arbitrary time point is corresponding;

Mobile terminal is extracted in serving cell signal prediction of strength value corresponding to described arbitrary time point and adjacent cell signal strength signal intensity predicted value from the vector that described arbitrary time point is corresponding.

10. device as claimed in claim 6, it is characterized in that, described selection module comprises:

Chooser module, for according to described serving cell signal prediction of strength value and described adjacent cell signal strength signal intensity predicted value, from described follow-up multiple time point, the difference of corresponding adjacent cell signal strength signal intensity predicted value and serving cell signal prediction of strength value is selected to be greater than all time points of described preset signal strength threshold value;

From described all time points, select the time point of closest described current point in time as described very first time point.

11. 1 kinds of network equipments, is characterized in that, comprise the switch decision device as described in claim arbitrary in claim 6 to 10.