CN104519540B - A kind of switch determining method, device and network side equipment - Google Patents
A kind of switch determining method, device and network side equipment Download PDFInfo
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- CN104519540B CN104519540B CN201310459809.6A CN201310459809A CN104519540B CN 104519540 B CN104519540 B CN 104519540B CN 201310459809 A CN201310459809 A CN 201310459809A CN 104519540 B CN104519540 B CN 104519540B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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Abstract
A kind of switch determining method of offer of the embodiment of the present invention, device and network side equipment.The method includes：Mobile terminal is obtained in subsequently multiple time points corresponding serving cell signal prediction of strength value and adjacent cell signal strength predicted value；According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, first time point, mobile terminal is selected to be more than preset signal strength threshold value in the difference of the corresponding serving cell signal prediction of strength value of the first time point and adjacent cell signal strength predicted value from follow-up multiple time points；Judge whether the first time point is less than preset time threshold value relative to the delay time of current point in time, obtain judging result, the preset time threshold value is not more than the handover delay of mobile terminal；When the judging result is to be, switching command is initiated to mobile terminal.The embodiment of the present invention improves the possibility that mobile terminal switches successfully in high-speed mobile environment.
Description
Technical field
The present invention relates to a kind of wireless domain more particularly to switch determining method, device and network side equipments.
Background technology
At present mobile communication system generally using based on signal strength switching method and a kind of basic switching
Decision method.The basic principle of the switch determining method is：In mobile terminal（Such as mobile phone）In the M measurement report reported, such as
Fruit wherein N（N is less than a value equal to M, is configured by network parameter）In a measurement report, report that some is adjacent small
When the signal strength in area is both greater than current service cell, then initiate to switch.
Since mobile terminal may be mobile in the overlapping covered state for remaining static or moving back and forth
HO hysteresis this parameter is also introduced in communication system（A kind of signal strength amount）Pingpang handoff is avoided, only when one section
The signal strength of the neighboring communities Jian Nei be more than serving cell signal strength and HO hysteresis and when, just initiate switch.
But there are this problems for this switching method based on signal strength：In high-speed mobile environment, if one
It is switched in the section time by judging multiple measurement reports, when being likely to be received first measurement report therein just
It can initiate to switch, but reliably be adjudicated and missed an opportunity because of a delay because of to wait for subsequent measurement, and high-speed mobile ring
Mobile terminal is again mobile very soon in border, to probably just reach serving cell side soon when starting to execute switching
Edge, and not yet complete switching and just have moved out serving cell, and lead to handover failure.
Invention content
In view of this, the purpose of the embodiment of the present invention is to provide a kind of switch determining method, device and network side equipment, with
Improve the possibility that mobile terminal switches successfully in high-speed mobile environment.
In order to solve the above technical problems, offer of embodiment of the present invention scheme is as follows：
The embodiment of the present invention provides a kind of switch determining method, including：
Mobile terminal is obtained in subsequently multiple time points corresponding serving cell signal prediction of strength value and adjacent cell
Signal strength predicted value；
According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from described follow-up more
First time point is selected in a time point, mobile terminal is in the corresponding serving cell signal prediction of strength value of the first time point
And the difference of adjacent cell signal strength predicted value is more than preset signal strength threshold value；
Judge whether the first time point is less than preset time threshold value relative to the delay time of current point in time, obtains
Judging result, the preset time threshold value is taken to be not more than the handover delay of mobile terminal；
When the judging result is to be, switching command is initiated to mobile terminal.
Preferably, the acquisition mobile terminal is in subsequently multiple time points corresponding serving cell signal prediction of strength
Value and adjacent cell signal strength predicted value include：
The first service cell signal strength and the first adjacent cell signal strength that are currently reported according to mobile terminal and movement
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before terminal, it is pre- to generate the serving cell signal intensity
Measured value and the adjacent cell signal strength predicted value.
Preferably, the first service cell signal strength currently reported according to mobile terminal and the first adjacent cell signal
It is small to generate the service for the serving cell signal intensity and adjacent cell signal strength repeatedly reported before intensity and mobile terminal
Area's signal strength predicted value and the adjacent cell signal strength predicted value include：
According to the first service cell signal strength and the serving cell signal intensity repeatedly reported, service is generated
The first anticipation function that cell signal strength changes over time；
According to the first adjacent cell signal strength and the adjacent cell signal strength repeatedly reported, adjacent cell letter is generated
The second anticipation function that number intensity changes over time；
To each time point in follow-up multiple time points, by each time point in first anticipation function
Upper corresponding serving cell signal intensity is pre- in the corresponding serving cell signal intensity of each time point as mobile terminal
Measured value, using each time point on second anticipation function corresponding adjacent cell signal strength as mobile terminal in institute
State the corresponding adjacent cell signal strength predicted value of each time point.
Preferably, it is described repeatedly in time interval between two time points twice, follow-up multiple time points two-by-two
Between time interval, first time point in follow-up multiple time points and between the time between the current point in time
Every and the current point in time and it is described repeatedly in last time time point between time interval all same；
First anticipation function and second anticipation function are polynomial function, the polynomial function because become
Amount is the vector variable being made of serving cell signal intensity and adjacent cell signal strength；
It is described according to the first service cell signal strength and the serving cell signal intensity repeatedly reported, generate
The first anticipation function that serving cell signal intensity changes over time；According to the first adjacent cell signal strength and it is described repeatedly
The adjacent cell signal strength reported, generate adjacent cell signal strength change over time the second anticipation function the step of include：
According to the first service cell signal strength and the first adjacent cell signal strength, generation is taken by described first
The first vector that cell signal strength of being engaged in and the first adjacent cell signal strength are constituted；
According to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell signal strength, generate by described every
The second vector that the secondary serving cell signal intensity reported and adjacent cell signal strength are constituted；
By all second vectors of first vector sum, according to corresponding time point chronological order into
Row sequence, the vector sequence after being sorted；
In the case where all coefficients of the polynomial function are unknown, the vector sequence and the multinomial are calculated
Error expression between expression formula sequence of the function on the corresponding time point sequence of the vector sequence；
Using all coefficients as the variable of the error expression, enable the error expression to all coefficients
In the variable partial derivative of each coefficient be respectively zero, obtain k rank equation groups, wherein the number of all coefficients is k；
The k ranks equation group is solved, all coefficients are obtained；
According to all coefficients, the polynomial function is generated；
The each time point in follow-up multiple time points, by each time point in first prediction
Corresponding serving cell signal intensity is strong in the corresponding serving cell signal of each time point as mobile terminal on function
Spend predicted value, using each time point on second anticipation function corresponding adjacent cell signal strength as mobile terminal
In each time point corresponding adjacent cell signal strength predicted value the step of, in follow-up multiple time points
Any time point, mobile terminal are strong in the corresponding serving cell signal prediction of strength value of any time point and adjacent cell signal
Degree predicted value obtains in the following way：
Determine that any time point continues in the rear in the sequence that multiple time points form according to chronological order
Serial number；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described
Any time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding service of any time point
Cell signal strength predicted value and adjacent cell signal strength predicted value.
It is preferably, described according to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value,
Selection first time point includes from follow-up multiple time points：
According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from described follow-up more
The difference of corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength value is selected to be more than in a time point described
All time points of preset signal strength threshold value；
Select the time point closest to the current point in time as the first time point from all time points.
The embodiment of the present invention also provides a kind of switch decision device, including：
Acquisition module, it is pre- in subsequently multiple time points corresponding serving cell signal intensity for obtaining mobile terminal
Measured value and adjacent cell signal strength predicted value；
Selecting module, for being predicted according to the serving cell signal prediction of strength value and the adjacent cell signal strength
Value selects first time point, mobile terminal small in the corresponding service of the first time point from follow-up multiple time points
The difference of area's signal strength predicted value and adjacent cell signal strength predicted value is more than preset signal strength threshold value；
Judgment module is preset for judging whether the first time point is less than relative to the delay time of current point in time
Time gate limit value, obtains judging result, and the preset time threshold value is not more than the handover delay of mobile terminal；
Initiation module, for when the judging result is to be, switching command to be initiated to mobile terminal.
Preferably, the acquisition module includes：
Generate submodule, the first service cell signal strength for currently being reported according to mobile terminal and the first adjacent cell
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before signal strength and mobile terminal, generates the clothes
Cell signal strength predicted value of being engaged in and the adjacent cell signal strength predicted value.
Preferably, the generation submodule includes：
First generation unit, for according to the first service cell signal strength and the serving cell repeatedly reported
Signal strength generates the first anticipation function that serving cell signal intensity changes over time；
Second generation unit, for according to the first adjacent cell signal strength and the adjacent cell signal repeatedly reported
Intensity generates the second anticipation function that adjacent cell signal strength changes over time；
Determination unit is used for each time point in follow-up multiple time points, by each time point in institute
Corresponding serving cell signal intensity is stated on the first anticipation function as mobile terminal in the corresponding service of each time point
Cell signal strength predicted value, by each time point, corresponding adjacent cell signal strength is made on second anticipation function
It is mobile terminal in the corresponding adjacent cell signal strength predicted value of each time point.
Preferably, it is described repeatedly in time interval between two time points twice, follow-up multiple time points two-by-two
Between time interval, first time point in follow-up multiple time points and between the time between the current point in time
Every and the current point in time and it is described repeatedly in last time time point between time interval all same；
First anticipation function and second anticipation function are polynomial function, the polynomial function because become
Amount is the vector variable being made of serving cell signal intensity and adjacent cell signal strength；
First generation unit；Second generation unit includes：
First generates subelement, for strong according to the first service cell signal strength and the first adjacent cell signal
Degree generates the first vector being made of the first service cell signal strength and the first adjacent cell signal strength；
Second generates subelement, for according to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell believe
Number intensity generates the second vector being made of the serving cell signal intensity reported every time and adjacent cell signal strength；
Sorting subunit is used for by all second vectors of first vector sum, according to corresponding time point
Chronological order be ranked up, the vector sequence after being sorted；
Third generates subelement, in the case where all coefficients of the polynomial function are unknown, calculating the arrow
Measure sequence, the error between expression formula sequence of the polynomial function on the corresponding time point sequence of the vector sequence
Expression formula；Using all coefficients as the variable of the error expression, enable the error expression to all coefficients
In the variable partial derivative of each coefficient be respectively zero, obtain k rank equation groups, wherein the number of all coefficients is k；It asks
The k ranks equation group is solved, all coefficients are obtained；According to all coefficients, the polynomial function is generated；
In the determination unit, for any time point in follow-up multiple time points, mobile terminal is at described
One time point corresponding serving cell signal prediction of strength value and adjacent cell signal strength predicted value obtain in the following way：
Determine that any time point continues in the rear in the sequence that multiple time points form according to chronological order
Serial number；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described
Any time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding service of any time point
Cell signal strength predicted value and adjacent cell signal strength predicted value.
Preferably, the selecting module includes：
Submodule is selected, for being predicted according to the serving cell signal prediction of strength value and the adjacent cell signal strength
Value selects corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength from follow-up multiple time points
The difference of value is more than all time points of the preset signal strength threshold value；
Select the time point closest to the current point in time as the first time point from all time points.
The embodiment of the present invention also provides a kind of network side equipment including above-described switch decision device.
From the above as can be seen that the embodiment of the present invention at least has the advantages that：
In high-speed mobile environment, correspondence adjacent cell signal strength and serving cell signal intensity of the mobile terminal in prediction
Difference be more than preset signal strength threshold value time point before begin to execute switching, moved under existing handover decision mechanism
Terminal is needed in the big Mr. Yu's signal strength door of difference for actually measuring obtained adjacent cell signal strength and serving cell signal intensity
It could start after limit value to execute switching and compare, the time point for starting to execute switching shifts to an earlier date, and since the time point is relative to working as
The delay time at preceding time point is less than the handover delay of mobile terminal, shortly can after reaching the time point to mobile terminal
Switching is completed, to improve the possibility of mobile terminal handover success.
Description of the drawings
Fig. 1 shows a kind of step flow charts of switch determining method provided in an embodiment of the present invention；
Fig. 2 indicates that the step of switch determining method based on vector mapping of the better embodiment of the embodiment of the present invention flows
Cheng Tu；
Fig. 3 indicates that the revised polynomial prediction curve of utilization of the better embodiment of the embodiment of the present invention calculates shifting
Dynamic platform starts the detailed process schematic diagram of the reasonable time point of switching；
Fig. 4 indicates a kind of structural schematic diagram of switch decision device provided in an embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, real below in conjunction with attached drawing and specifically
Example is applied the embodiment of the present invention is described in detail.
Fig. 1 shows a kind of step flow charts of switch determining method provided in an embodiment of the present invention, referring to Fig.1, the present invention
Embodiment provides a kind of switch determining method, includes the following steps：
Step 101, mobile terminal is obtained in subsequently multiple time points corresponding serving cell signal prediction of strength value
With adjacent cell signal strength predicted value；
Step 102, according to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from institute
Stating in follow-up multiple time points selects first time point, mobile terminal strong in the corresponding serving cell signal of the first time point
The difference for spending predicted value and adjacent cell signal strength predicted value is more than preset signal strength threshold value；
Step 103, judge whether the first time point is less than preset time relative to the delay time of current point in time
Threshold value, obtains judging result, and the preset time threshold value is not more than the handover delay of mobile terminal；
Step 104, when the judging result is to be, switching command is initiated to mobile terminal.
As it can be seen that by the above-mentioned means, in high-speed mobile environment, correspondence adjacent cell signal strength of the mobile terminal in prediction
And the difference of serving cell signal intensity begins to execute switching before being more than the time point of preset signal strength threshold value, and existing
Under handover decision mechanism mobile terminal need actually measure obtained adjacent cell signal strength and serving cell signal intensity it
It could start to execute to switch after poor big Mr. Yu's signal strength threshold value and compare, the time point for starting to execute switching shifts to an earlier date, and by
In the time point relative to current point in time delay time be less than mobile terminal handover delay, to mobile terminal reach should
It can shortly complete to switch after time point, to improve the possibility of mobile terminal handover success.
Wherein, the preset signal strength threshold value is for example：0, HO hysteresis etc. specifically can be according to network actual state
It is set.
In embodiments of the present invention, the acquisition mobile terminal is in subsequently multiple time points corresponding serving cell letter
Number prediction of strength value and adjacent cell signal strength predicted value may include：
The first service cell signal strength and the first adjacent cell signal strength that are currently reported according to mobile terminal and movement
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before terminal, it is pre- to generate the serving cell signal intensity
Measured value and the adjacent cell signal strength predicted value.
Wherein, the first service cell signal strength currently reported according to mobile terminal and the first adjacent cell signal are strong
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before degree and mobile terminal, generates the serving cell
Signal strength predicted value and the adjacent cell signal strength predicted value may include：
According to the first service cell signal strength and the serving cell signal intensity repeatedly reported, service is generated
The first anticipation function that cell signal strength changes over time；
According to the first adjacent cell signal strength and the adjacent cell signal strength repeatedly reported, adjacent cell letter is generated
The second anticipation function that number intensity changes over time；
To each time point in follow-up multiple time points, by each time point in first anticipation function
Upper corresponding serving cell signal intensity is pre- in the corresponding serving cell signal intensity of each time point as mobile terminal
Measured value, using each time point on second anticipation function corresponding adjacent cell signal strength as mobile terminal in institute
State the corresponding adjacent cell signal strength predicted value of each time point.
Here, first anticipation function and second anticipation function can be different, in this case, to serving cell
The prediction of signal strength and the prediction of adjacent cell signal strength is carried out respectively, prediction result may be not accurate enough, there is mirror
In this, serving cell signal intensity and adjacent cell signal strength can be considered as vector to generate a unified anticipation function,
To improve the accuracy of prediction, below by taking the anticipation function is polynomial function as an example, illustrate：
It is described repeatedly in time interval between two time points twice, follow-up multiple time points between any two when
Between interval, first time point in follow-up multiple time points and the time interval between the current point in time and described
Current point in time and it is described repeatedly in last time time point between time interval all same；
The first function and the second function are polynomial function, and the dependent variable of the polynomial function is by taking
The vector variable that cell signal strength of being engaged in and adjacent cell signal strength are constituted；
It is described according to the first service cell signal strength and the serving cell signal intensity repeatedly reported, generate
The first function that serving cell signal intensity changes over time；It described reports according to the first adjacent cell signal strength and repeatedly
Adjacent cell signal strength, generate adjacent cell signal strength change over time second function the step of include：
According to the first service cell signal strength and the first adjacent cell signal strength, generation is taken by described first
The first vector that cell signal strength of being engaged in and the first adjacent cell signal strength are constituted；
According to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell signal strength, generate by described every
The second vector that the secondary serving cell signal intensity reported and adjacent cell signal strength are constituted；
By all second vectors of first vector sum, according to corresponding time point chronological order into
Row sequence, the vector sequence after being sorted；
In the case where all coefficients of the polynomial function are unknown, the vector sequence and the multinomial are calculated
Error expression between expression formula sequence of the function on the corresponding time point sequence of the vector sequence；
Using all coefficients as the variable of the error expression, enable the error expression to all coefficients
In the variable partial derivative of each coefficient be respectively zero, obtain k rank equation groups, wherein the number of all coefficients is k；
The k ranks equation group is solved, all coefficients are obtained；
According to all coefficients, the polynomial function is generated；
The each time point in follow-up multiple time points, by each time point in the first function
Upper corresponding serving cell signal intensity is pre- in the corresponding serving cell signal intensity of each time point as mobile terminal
Measured value, using each time point in the second function corresponding adjacent cell signal strength as mobile terminal described every
In the step of a time point corresponding adjacent cell signal strength predicted value, for any time in follow-up multiple time points
Point, mobile terminal is in the corresponding serving cell signal prediction of strength value of any time point and adjacent cell signal strength predicted value
It obtains in the following way：
Determine that any time point continues in the rear in the sequence that multiple time points form according to chronological order
Serial number；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described
Any time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding service of any time point
Cell signal strength predicted value and adjacent cell signal strength predicted value.
Certainly, those skilled in the art with existing other anticipation functions it should also be appreciated that replace polynomial function pair
Signal strength is predicted, is also all possible.
In embodiments of the present invention, described strong according to the serving cell signal prediction of strength value and the adjacent cell signal
Predicted value is spent, selection first time point may include from follow-up multiple time points：
According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from described follow-up more
The difference of corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength value is selected to be more than in a time point described
All time points of preset signal strength threshold value；
Select the time point closest to the current point in time as the first time point from all time points.
Wherein, the case where only including a time point for all time points, then the time point is exactly described first
Time point.
To illustrate to be more clearly understood the embodiment of the present invention, the preferable embodiment party of the embodiment of the present invention is provided below
Formula.
With reference to Fig. 2, this better embodiment provides the switch determining method mapped based on vector, specific implementation process packet
It includes：The measurement data for acquiring mobile terminal first, data analysis is carried out after screening valid data.Terminal is taken in historical record
Serving cell and adjacent cell received signal strength and the current received signal strength of terminal are together as sample value is calculated, given
A sample value structure signal phasor and be mapped in two-dimensional space, obtain the k rank equations of signal phasor using variable local derviation
Then group finds out the polynomial curve expression formula of signal phasor using Doolittle triangle decompositions and is modified.Then it utilizes
Revised signal phasor expression formula calculates mobile terminal and reaches switching with required time interval, according to described from current location
The handover delay of time interval and mobile terminal calculates the reasonable time point that mobile terminal starts switching, when reaching reasonable
Between put when to mobile terminal initiate switching command, with ensure mobile terminal leave switching band before there is enough time to start in time
Switch and smoothly completes handoff procedure.This method can reduce the handover delay of mobile terminal so that mobile terminal can be timely
Switching is completed, the handover success rate for improving mobile terminal in high-speed mobile environment is conducive to.
Specifically, end message is recorded with the time interval of Δ t first, the information of mobile terminal includes that terminal exists
Current time TjReceive the signal strength X of current network service celljAnd the signal strength Y of adjacent cellj, in historical record
In take before n moment terminal serving cell and adjacent cell received signal strength and the current received signal strength of terminal make together
To calculate sample value, n is that preset sample chooses numerical value；By terminal received signals intensity（Including serving cell and adjacent cell）Structure
It builds signal phasor and is mapped in two-dimensional space, then n+1 given sample value is decomposed with vector form in x（Serving cell
Signal strength）, y（Adjacent cell signal strength）Coordinate representation on axis is shown below：
It establishes the version of polynomial repressentation terminal signaling vector, then n+1 sample value substitution can be calculated multinomial
Each term coefficient of formula.Multinomial is used firstIndicate terminal in Tj-nMoment is to TjThe function changed in the period at moment uses
Following formula indicates：
If TiAt the time of indicating i-th of sample point, and Tj-n≤Ti≤Tj, the sample of mobile terminal received signal strength at this time
Value isThen predict that the error A of ordered series of numbers and sample value can be indicated with following formula：
To find out coefficient sets in above-mentioned formulaIt can incite somebody to actionIt is respectively seen as a variable, when accidentally
When poor A is minimum value, A can be enabled to each variable partial derivativeIt is zero, then can obtains k rank equation groups, be shown below：
It is write above-mentioned k ranks equation group as matrix form, is enabled：
X=(a0,a1…ak)
Then above-mentioned k ranks equation group can be expressed as A'x=b, using Doolittle decompose matrix A ' write as following two
The form of matrix multiple：
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=in this way
(LU) x=L (Ux)=b, enables Ux=y, then original system of linear equations A'=LU turns to two simple trigonometric equation groups：Ux=y and
Ly=b.Then Ly=b can be solved first and obtains vectorial y, then solves Ux=y, and system of linear equations A'x=b is solved to reach
Purpose.
If matrix A ' Doolittle be decomposed into：
To find out matrix L and U, according to matrix multiplication rule, have：
It is converted into formula, is shown below：
According to matrix multiplication and equal definition, have：
Obtain formula：
u1j=a1jJ=1,2 ..., n
li1=ai1/u11J=2,3 ..., n
As i≤j, can obtain：
Doolittle decomposition formulas can be obtained according to above equation：
When coefficient matrices A ' complete A'=LU decompose after, equation group A'x=b just turn to A'x=(LU) x=L (Ux)=
B is equivalent to solve two equation groups Ly=b and Ux=y, and specific formula for calculation is：
Coefficient sets are solved by Doolittle decomposition methodsValue after,
It is substituted intoIn, the polynomial expression formula of signal receiving strength can be obtainedAccording to expression formulaVariation tendency, computing terminal is in Tj+1The received signal strength at moment, is shown below：
Sj+1=Sj(j+1)
Then to gained signal phasor multinomialIt is modified, is described as follows：
For actual terminal signaling vector sample point,Indicate that terminal is in T before correctingj+1
Time-ofday signals receive the predicted value of intensity, i.e., for by signal phasor multinomialThe signal phasor calculated,It indicates
Terminal is in T after amendmentj+1The predicted value of time-ofday signals vector,Indicate modified error amount,Indicate TiThe practical letter at moment
Number vector sample value enables
（Formula 1）
Then revised sample valueIt can be obtained by following formula：
In above formula, S'iIndicate TiThe correction value of moment terminal signaling vector real sample values, Δ SiIndicate TiMoment terminal
The predicted value of signal phasor and the error amount of real sample values.
It willReplace in sampleNew sample is formed, new k ranks equation group is obtained according to above method and is utilized
Doolittle decomposition methods solve coefficient sets and then substitute into, and can obtain revised polynomial prediction curve
Find out the polynomial prediction curve of signal phasorIt afterwards, can be to the level of subsequent adjacent cell and serving cell
Difference is calculated, and the level difference that can obtain adjacent cell and serving cell reaches the time point of switching condition.With reference to Fig. 3, specifically
Process is as follows：
According to revised multinomial numerical curveIt calculates using current point in time as the follow-up m time point of starting point
On received signal strength value, can be denoted asThen according to preset adjacent cell and service
The level difference of cell meets the threshold value R of switching condition, and the threshold of switching condition is met according to the level difference of adjacent cell and serving cell
Value R, in Tj+1, Tj+2... Tj+mThe middle time point t for finding the condition that meets：
If being not present, continue the time point for finding the condition that meets according to the method described above in next statistics point.If in the presence of,
It then calculates and meets the predicted time point of condition and the shortest time interval delta T of current point in time（If meeting condition there are multiple
Time point）, judge whether Δ T meets switching criterion requirement.Wherein, next statistics point refers to receiving mobile terminal newly to measure
The time point of report updates vector expression according to newest sample point according to the method described above.
If Δ T is unsatisfactory for switching criterion requirement, continues searching according to the method described above in next statistics point and meet condition
Time point and continue to judge whether Δ T meets switching criterion requirement.
If whether Δ T meets switching criterion requirement, start switching command.
The switching criterion requirement, refers to the time point that mobile terminal reaches switching band（Adjacent cell and serving cell
Level difference meets the time point of switching threshold R）It is less than preset time interval thresholding with the difference DELTA T of current point in time（Switching
Thresholding）Time_threshold, i.e.,：
Δ T < Time_threshold
Wherein, Time_threshold refers to the handover delay of mobile terminal.
Those skilled in the art it is also evident that, multinomial is modified be in order to subsequent signal estimation value carry out
It is more accurate when calculating, reduce error that may be present, certainly, using the multinomial before amendment to subsequent signal estimation value into
Row calculates also possible.
Switching method based on signal strength is suitble to use in common scenarios, still, it is contemplated that mobile terminal is in high speed
Feature in mobile environment may be mobile if still switched over whithin a period of time by judging multiple measurement reports
Terminal is not yet completed to have moved out serving cell when switching, and leads to dropped calls.In highway, high-speed railway, city
In the mobile communication system in the regions such as through street, the feature for linearly covering, fast moving and unidirectionally moving, according to current
Mobile terminal execution switching is controlled based on the switch determining method of signal strength, can there are problems that as above analyzing, be easy to lead
Cause mobile terminal handover failure.But if adjusting parameter, only switched over according to a small amount of measurement report, and may cause
The mobile terminal moved slowly at generates pingpang handoff, influences communication effect in call.That is, universal in mobile communication system
The switching method based on decision signal intensity used is unsuitable for using in the scene of mobile terminal high-speed mobile.
It is easy to cause handover failure when using the switching method based on signal strength for the mobile terminal fast moved
Problem, when the switch determining method based on vector mapping that this better embodiment proposes can reduce the switching of mobile terminal
Prolong so that mobile terminal can be completed to switch in time, be conducive to improve the handover success rate under mobile terminal high-speed mobile.
This better embodiment is according to given sample value structure signal phasor and is mapped in two-dimensional space, utilizes change
Amount local derviation obtains the k rank equation groups of signal phasor, and the multinomial that signal phasor is then found out using Doolittle triangle decompositions is bent
Line expression formula is simultaneously modified.Then mobile terminal is calculated from current location to Dutch using revised signal phasor expression formula
Then time interval needed for tape swapping calculates mobile terminal according to the handover delay of the time interval and mobile terminal and opens
The reasonable time point of dynamic switching, and start switching when mobile terminal reaches reasonable time point.Mobile terminal can be shortened in height
Handover delay under fast situation of movement ensures that mobile terminal is put at a reasonable time and switches over, disclosure satisfy that mobile terminal exists
Switching demand in the case of high-speed mobile.Enable mobile terminal quickly and correctly start switching, makes the shifting fast moved
Mobile communication terminal quickly, efficiently and reliably can be switched to another cell from a cell, keep Session continuity, favorably
Handover success rate in the case of improving mobile terminal high-speed mobile, final lifting region communication quality.This better embodiment
According to the handover delay of the time interval and mobile terminal calculate mobile terminal start switching reasonable time point, up to
To when starting switching when reasonable time point, so switching time can be shortened, the mobile terminal of high-speed mobile can be avoided to miss and cut
The reasonable chance changed, ensure that communication effect, reduce 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, including：
Acquisition module 401 is strong in subsequently multiple time points corresponding serving cell signal for obtaining mobile terminal
Spend predicted value and adjacent cell signal strength predicted value；
Selecting module 402, for pre- according to the serving cell signal prediction of strength value and the adjacent cell signal strength
Measured value selects first time point from follow-up multiple time points, and mobile terminal is in the corresponding service of the first time point
The difference of cell signal strength predicted value and adjacent cell signal strength predicted value is more than preset signal strength threshold value；
Judgment module 403, for judging whether the first time point is less than relative to the delay time of current point in time
Preset time threshold value, obtains judging result, and the preset time threshold value is not more than the handover delay of mobile terminal；
Initiation module 404, for when the judging result is to be, switching command to be initiated to mobile terminal.
As it can be seen that by the above-mentioned means, in high-speed mobile environment, correspondence adjacent cell signal strength of the mobile terminal in prediction
And the difference of serving cell signal intensity begins to execute switching before being more than the time point of preset signal strength threshold value, and existing
Under handover decision mechanism mobile terminal need actually measure obtained adjacent cell signal strength and serving cell signal intensity it
It could start to execute to switch after poor big Mr. Yu's signal strength threshold value and compare, the time point for starting to execute switching shifts to an earlier date, and by
In the time point relative to current point in time delay time be less than mobile terminal handover delay, to mobile terminal reach should
It can shortly complete to switch after time point, to improve the possibility of mobile terminal handover success.
Wherein, the acquisition module 401 may include：
Generate submodule, the first service cell signal strength for currently being reported according to mobile terminal and the first adjacent cell
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before signal strength and mobile terminal, generates the clothes
Cell signal strength predicted value of being engaged in and the adjacent cell signal strength predicted value.
The generation submodule may include：
First generation unit, for according to the first service cell signal strength and the serving cell repeatedly reported
Signal strength generates the first anticipation function that serving cell signal intensity changes over time；
Second generation unit, for according to the first adjacent cell signal strength and the adjacent cell signal repeatedly reported
Intensity generates the second anticipation function that adjacent cell signal strength changes over time；
Determination unit is used for each time point in follow-up multiple time points, by each time point in institute
Corresponding serving cell signal intensity is stated on the first anticipation function as mobile terminal in the corresponding service of each time point
Cell signal strength predicted value, by each time point, corresponding adjacent cell signal strength is made on second anticipation function
It is mobile terminal in the corresponding adjacent cell signal strength predicted value of each time point.
Specifically, Ke Yiyou：
It is described repeatedly in time interval between two time points twice, follow-up multiple time points between any two when
Between interval, first time point in follow-up multiple time points and the time interval between the current point in time and described
Current point in time and it is described repeatedly in last time time point between time interval all same；
First anticipation function and second anticipation function are polynomial function, the polynomial function because become
Amount is the vector variable being made of serving cell signal intensity and adjacent cell signal strength；
First generation unit；Second generation unit includes：
First generates subelement, for strong according to the first service cell signal strength and the first adjacent cell signal
Degree generates the first vector being made of the first service cell signal strength and the first adjacent cell signal strength；
Second generates subelement, for according to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell believe
Number intensity generates the second vector being made of the serving cell signal intensity reported every time and adjacent cell signal strength；
Sorting subunit is used for by all second vectors of first vector sum, according to corresponding time point
Chronological order be ranked up, the vector sequence after being sorted；
Third generates subelement, in the case where all coefficients of the polynomial function are unknown, calculating the arrow
Measure sequence, the error between expression formula sequence of the polynomial function on the corresponding time point sequence of the vector sequence
Expression formula；Using all coefficients as the variable of the error expression, enable the error expression to all coefficients
In the variable partial derivative of each coefficient be respectively zero, obtain k rank equation groups, wherein the number of all coefficients is k；It asks
The k ranks equation group is solved, all coefficients are obtained；According to all coefficients, the polynomial function is generated；
In the determination unit, for any time point in follow-up multiple time points, mobile terminal is at described
One time point corresponding serving cell signal prediction of strength value and adjacent cell signal strength predicted value obtain in the following way：
Determine that any time point continues in the rear in the sequence that multiple time points form according to chronological order
Serial number；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described
Any time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding service of any time point
Cell signal strength predicted value and adjacent cell signal strength predicted value.
In addition, the selecting module 402 may include：
Submodule is selected, for being predicted according to the serving cell signal prediction of strength value and the adjacent cell signal strength
Value selects corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength from follow-up multiple time points
The difference of value is more than all time points of the preset signal strength threshold value；
Select the time point closest to the current point in time as the first time point from all time points.
The embodiment of the present invention also provides a kind of network side equipment, and the network side equipment includes above-described switch decision
Device.The network side equipment is for example：LTE base station.
The above is only the embodiment of the embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, under the premise of not departing from principle of the embodiment of the present invention, can also make several improvements and retouch, these improve and
Retouching also should be regarded as the protection domain of the embodiment of the present invention.
Claims (9)
1. a kind of switch determining method, which is characterized in that including：
Mobile terminal is obtained in subsequently multiple time points corresponding serving cell signal prediction of strength value and adjacent cell signal
Prediction of strength value, including：The first service cell signal strength and the first adjacent cell signal currently reported according to mobile terminal is strong
The serving cell signal intensity and adjacent cell signal strength repeatedly reported before degree and mobile terminal, generates the serving cell
Signal strength predicted value and the adjacent cell signal strength predicted value；
According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from it is described follow-up multiple when
Between put in select first time point, mobile terminal the corresponding serving cell signal prediction of strength value of the first time point with it is adjacent
The difference of cell signal strength predicted value is more than preset signal strength threshold value；
Judge whether the first time point is less than preset time threshold value relative to the delay time of current point in time, acquisition is sentenced
Break as a result, the preset time threshold value is not more than the handover delay of mobile terminal；
When the judging result is to be, switching command is initiated to mobile terminal.
2. the method as described in claim 1, which is characterized in that the first service cell currently reported according to mobile terminal
The serving cell signal intensity and adjacent cell repeatedly reported before signal strength and the first adjacent cell signal strength and mobile terminal
Signal strength, generates the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value includes：
According to the first service cell signal strength and the serving cell signal intensity repeatedly reported, serving cell is generated
The first anticipation function that signal strength changes over time；
According to the first adjacent cell signal strength and the adjacent cell signal strength repeatedly reported, it is strong to generate adjacent cell signal
Spend the second anticipation function changed over time；
It is to each time point in follow-up multiple time points, each time point is right on first anticipation function
The serving cell signal intensity answered as mobile terminal in the corresponding serving cell signal prediction of strength value of each time point,
Using each time point on second anticipation function corresponding adjacent cell signal strength as mobile terminal described every
A time point corresponding adjacent cell signal strength predicted value.
3. method as claimed in claim 2, which is characterized in that it is described repeatedly between time between adjacent time point twice
Every, the time interval of follow-up multiple time points between any two, first time point in follow-up multiple time points with
Time interval and the current point in time between the current point in time with it is described repeatedly in last time time point it
Between time interval all same；
First anticipation function and second anticipation function are polynomial function, and the dependent variable of the polynomial function is
The vector variable being made of serving cell signal intensity and adjacent cell signal strength；
It is described according to the first service cell signal strength and the serving cell signal intensity repeatedly reported, generate service
The first anticipation function that cell signal strength changes over time；It described reports according to the first adjacent cell signal strength and repeatedly
Adjacent cell signal strength, generate adjacent cell signal strength change over time the second anticipation function the step of include：
According to the first service cell signal strength and the first adjacent cell signal strength, generate small by the first service
The first vector that area's signal strength and the first adjacent cell signal strength are constituted；
According to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell signal strength, generate by it is described every time on
The second vector that the serving cell signal intensity and adjacent cell signal strength of report are constituted；
By all second vectors of first vector sum, arranged according to the chronological order at corresponding time point
Sequence, the vector sequence after being sorted；
In the case where all coefficients of the polynomial function are unknown, the vector sequence and the polynomial function are calculated
The error expression between expression formula sequence on the corresponding time point sequence of the vector sequence；
Using all coefficients as the variable of the error expression, enable the error expression in all coefficients
The variable partial derivative of each coefficient is respectively zero, obtains k rank equation groups, wherein the number of all coefficients is k；
The k ranks equation group is solved, all coefficients are obtained；
According to all coefficients, the polynomial function is generated；
The each time point in follow-up multiple time points, by each time point in first anticipation function
Upper corresponding serving cell signal intensity is pre- in the corresponding serving cell signal intensity of each time point as mobile terminal
Measured value, using each time point on second anticipation function corresponding adjacent cell signal strength as mobile terminal in institute
In the step of stating each time point corresponding adjacent cell signal strength predicted value, for any in follow-up multiple time points
Time point, mobile terminal are pre- in the corresponding serving cell signal prediction of strength value of any time point and adjacent cell signal strength
Measured value obtains in the following way：
Determine that any time point continues the serial number in the sequence that multiple time points form according to chronological order in the rear；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described any
Time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains described
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding serving cell of any time point
Signal strength predicted value and adjacent cell signal strength predicted value.
4. the method as described in claim 1, which is characterized in that described according to the serving cell signal prediction of strength value and institute
Adjacent cell signal strength predicted value is stated, selection first time point includes from follow-up multiple time points：
According to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from it is described follow-up multiple when
Between put in select the difference of corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength value be more than it is described preset
All time points of signal strength threshold value；
Select the time point closest to the current point in time as the first time point from all time points.
5. a kind of switch decision device, which is characterized in that including：
Acquisition module, for obtaining mobile terminal in subsequently multiple time points corresponding serving cell signal prediction of strength value
With adjacent cell signal strength predicted value；Acquisition module includes：Generation submodule, first for currently being reported according to mobile terminal
The serving cell signal intensity repeatedly reported before serving cell signal intensity and the first adjacent cell signal strength and mobile terminal
With adjacent cell signal strength, the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value are generated；
Selecting module, for according to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value, from
First time point is selected in follow-up multiple time points, mobile terminal is in the corresponding serving cell signal of the first time point
The difference of prediction of strength value and adjacent cell signal strength predicted value is more than preset signal strength threshold value；
Judgment module, for judging whether the first time point is less than preset time relative to the delay time of current point in time
Threshold value, obtains judging result, and the preset time threshold value is not more than the handover delay of mobile terminal；
Initiation module, for when the judging result is to be, switching command to be initiated to mobile terminal.
6. device as claimed in claim 5, which is characterized in that the generation submodule includes：
First generation unit, for according to the first service cell signal strength and the serving cell signal repeatedly reported
Intensity generates the first anticipation function that serving cell signal intensity changes over time；
Second generation unit, for strong according to the first adjacent cell signal strength and the adjacent cell signal repeatedly reported
Degree generates the second anticipation function that adjacent cell signal strength changes over time；
Determination unit, for each time point in follow-up multiple time points, by each time point described the
On one anticipation function corresponding serving cell signal intensity as mobile terminal in the corresponding serving cell of each time point
Signal strength predicted value, using each time point on second anticipation function corresponding adjacent cell signal strength as move
Dynamic terminal is in the corresponding adjacent cell signal strength predicted value of each time point.
7. device as claimed in claim 6, which is characterized in that it is described repeatedly between time between adjacent time point twice
Every, the time interval of follow-up multiple time points between any two, first time point in follow-up multiple time points with
Time interval and the current point in time between the current point in time with it is described repeatedly in last time time point it
Between time interval all same；
First anticipation function and second anticipation function are polynomial function, and the dependent variable of the polynomial function is
The vector variable being made of serving cell signal intensity and adjacent cell signal strength；
First generation unit；Second generation unit includes：
First generates subelement, is used for according to the first service cell signal strength and the first adjacent cell signal strength,
Generate the first vector being made of the first service cell signal strength and the first adjacent cell signal strength；
Second generates subelement, for according to it is described repeatedly in the serving cell signal intensity that reports every time and adjacent cell signal it is strong
Degree generates the second vector being made of the serving cell signal intensity reported every time and adjacent cell signal strength；
Sorting subunit, for by all second vectors of first vector sum, according to corresponding time point when
Between sequencing be ranked up, the vector sequence after being sorted；
Third generates subelement, in the case where all coefficients of the polynomial function are unknown, calculating the vector sequence
Row, the error expression between expression formula sequence of the polynomial function on the corresponding time point sequence of the vector sequence
Formula；Using all coefficients as the variable of the error expression, enable the error expression in all coefficients
The variable partial derivative of each coefficient is respectively zero, obtains k rank equation groups, wherein the number of all coefficients is k；Solve institute
K rank equation groups are stated, all coefficients are obtained；According to all coefficients, the polynomial function is generated；
In the determination unit, for any time point in follow-up multiple time points, mobile terminal is when described any
Between put corresponding serving cell signal prediction of strength value and adjacent cell signal strength predicted value obtains in the following way：
Determine that any time point continues the serial number in the sequence that multiple time points form according to chronological order in the rear；
By the current point in time in the polynomial function the sum of corresponding independent variable and the serial number, as described any
Time point corresponding independent variable in the polynomial function；
By any time point, corresponding independent variable substitutes into the polynomial function in the polynomial function, obtains described
The corresponding vector of any time point；
Mobile terminal is extracted from the corresponding vector of any time point in the corresponding serving cell of any time point
Signal strength predicted value and adjacent cell signal strength predicted value.
8. device as claimed in claim 5, which is characterized in that the selecting module includes：
Submodule is selected, is used for according to the serving cell signal prediction of strength value and the adjacent cell signal strength predicted value,
Corresponding adjacent cell signal strength predicted value and serving cell signal prediction of strength value are selected from follow-up multiple time points
Difference be more than the preset signal strength threshold value all time points；
Select the time point closest to the current point in time as the first time point from all time points.
9. a kind of network side equipment, which is characterized in that include that switching as described in any claim in claim 5 to 8 is sentenced
Certainly device.
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| CN106792859A (en) * | 2017-01-19 | 2017-05-31 | 深圳前海弘稼科技有限公司 | A kind of data transmission method, server and controller |
| CN107205225B (en) * | 2017-08-03 | 2019-10-11 | 北京邮电大学 | The switching method and apparatus of unmanned aerial vehicle onboard base station based on user trajectory prediction |
| CN110113776B (en) * | 2019-04-29 | 2022-06-10 | 北京六捷科技有限公司 | Wireless network coverage trend prediction method and device based on big data technology |
| CN114513807B (en) * | 2020-11-16 | 2023-10-17 | ***通信集团有限公司 | Method, device, equipment and storage medium for determining network switching parameters |
| CN112449393B (en) * | 2020-12-23 | 2022-09-13 | 中国联合网络通信集团有限公司 | Cell switching method and terminal |
| CN113163002B (en) * | 2021-04-09 | 2022-06-17 | 深圳市腾讯网络信息技术有限公司 | Server switching method and device and storage medium |
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