CN105246113B - A kind of optimization method of LTE system pingpang handoff - Google Patents
A kind of optimization method of LTE system pingpang handoff Download PDFInfo
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- CN105246113B CN105246113B CN201510616705.0A CN201510616705A CN105246113B CN 105246113 B CN105246113 B CN 105246113B CN 201510616705 A CN201510616705 A CN 201510616705A CN 105246113 B CN105246113 B CN 105246113B
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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
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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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
Abstract
The invention discloses a kind of optimization method of LTE system pingpang handoff, including：It acquires magnanimity LTE data when mobile phone carries out pingpang handoff and is decoded；The magnanimity LTE data acquired are filtered according to default filter condition；Using different time intervals as pingpang handoff time delay, pingpang handoff quantitative statistics are carried out to the magnanimity LTE data after filtering；Linear statistical is carried out, and then obtain the separation of pingpang handoff to the pingpang handoff quantized result that statistics obtains；According to the separation of acquisition, with reference to the main switch instances taken between cell and adjacent cell, pingpang handoff parameter adjustment is carried out.The present invention can calculate round-trip switching times of certain serving cell from all adjacent cells in different pingpang handoff time delays automatically, and carry out optimizing and revising for pingpang handoff parameter after the separation of pingpang handoff can be obtained, pingpang handoff can be quantified, reliability is high and stability is high, can be widely applied in moving communicating field.
Description
Technical field
The present invention relates to wireless mobile communications field, particularly a kind of optimization method of LTE system pingpang handoff.
Background technology
Explanation of nouns：
eNodeB：The title of base station in Evolved Node B, i.e., evolved Node B, abbreviation eNB, LTE, compared to existing
Node B in 3G, are integrated with part RNC（Radio network controller, Radio Network Controller）Function, subtract
The level of agreement when having lacked communication；
Ocn：Adjacent cell individual character deviates, for the parameter of control targe native region priority.
What is used in LTE system is hard-switching technology, i.e. " connection of first having no progeny ".UE is first disconnected when switching
The connection of eNodeB establishes with target eNodeB connect again.Pingpang handoff refer to mobile phone serving cell and neighboring community come back into
The phenomenon that row switching, handover trigger time during pingpang handoff（TTT）And the reasonability of lag time will directly affect network
Performance and user perception.
Mobile robustness optimization（Mobility Robustness Optimization, abbreviation MRO）It is the phase to switching
Related parameter carries out an algorithm of Automatic Optimal, is SON（Full name Self-Organization Network, self-organizing network）
One of component part, primarily directed to the unreasonable situation of handoff parameter setting, such as switching is too early, too late or pingpang handoff
Situation optimize, avoid or reduce with switching relevant Radio Link Failure（Radio Link Failure, RLF）No
Necessity switching.The reliability that this algorithm goes out to export result is not high, and accurately pingpang handoff can not be quantified, and causes to set
Unreasonable serving cell brings LTE network larger unstability.
Invention content
In order to solve the technical issues of above-mentioned, the object of the present invention is to provide a kind of optimization sides of LTE system pingpang handoff
Method.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of optimization method of LTE system pingpang handoff, includes the following steps：
S1, magnanimity LTE data when mobile phone carries out pingpang handoff are acquired and are decoded；
S2, the magnanimity LTE data acquired are filtered according to default filter condition；
S3, using different time intervals as pingpang handoff time delay, the magnanimity LTE data after filtering are carried out with table tennis and is cut
Change quantitative statistics；
S4, linear statistical is carried out, and then obtain the separation of pingpang handoff to the pingpang handoff quantized result that statistics obtains；
S5, the separation according to acquisition with reference to the main switch instances taken between cell and adjacent cell, carry out pingpang handoff ginseng
Number adjustment.
Further, filter condition is preset described in the step S2 is：Using pingpang handoff time delay, pingpang handoff number and
Filter condition set by least one of pingpang handoff accounting parameter.
Further, the step S3 is specially：
Different time intervals is respectively adopted, as pingpang handoff time delay, rattles to the magnanimity LTE data after filtering
The quantitative statistics of switching times and pingpang handoff accounting.
Further, the step S4, including：
S41, using pingpang handoff time delay as abscissa, and the pingpang handoff quantized result obtained will be counted as vertical seat
Mark draws change curve；
Separation of the slope-inversion point as pingpang handoff on S42, acquisition change curve.
Further, the step S5, including：
S51, magnanimity LTE data are parsed, and then judges main to take whether cell switches between fixed adjacent cell
Frequently, if so, performing step S53, otherwise, step S52 is performed；
S52, the separation according to acquisition terminate after the handover trigger time parameter for the cell-level for adjusting pingpang handoff；
S53, the adjacent cell individual character offset parameter for adjusting minizone.
Further, it is further comprising the steps of after the step S5：
S6, the pingpang handoff parameter after adjustment is updated to LTE system, line trace of going forward side by side.
Further, the step S6 is specially：
After the pingpang handoff parameter update to LTE system after adjustment, the network performance index of LTE system is obtained, is judged
Whether the fluctuation range of acquired network performance index is in predetermined threshold value section, if then expression parameter adjustment is excessive,
Pingpang handoff parameter adjustment is re-started, otherwise is terminated.
The beneficial effects of the invention are as follows：A kind of optimization method of LTE system pingpang handoff of the present invention, including：S1, acquisition
Mobile phone carry out pingpang handoff when magnanimity LTE data and be decoded；S2, according to default filter condition to the magnanimity that is acquired
LTE data are filtered；S3, using different time intervals as pingpang handoff time delay, to the magnanimity LTE data after filtering into
Row pingpang handoff quantitative statistics；S4, linear statistical is carried out to the pingpang handoff quantized result that statistics obtains, and then obtains table tennis and cut
The separation changed；S5, the separation according to acquisition with reference to the main switch instances taken between cell and adjacent cell, carry out table tennis and cut
Change parameter adjustment.It is round-trip in different pingpang handoff time delays from all adjacent cells that this method can calculate certain serving cell automatically
Switching times, and optimizing and revising for pingpang handoff parameter is carried out after the separation of pingpang handoff can be obtained, this method can be right
Pingpang handoff is quantified, and reliability is high and stability is high.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of flow chart of the optimization method of LTE system pingpang handoff of the present invention；
Fig. 2 is to draw to obtain in an a kind of specific embodiment of the optimization method of LTE system pingpang handoff of the present invention
Change curve.
Specific embodiment
With reference to Fig. 1, the present invention provides a kind of optimization methods of LTE system pingpang handoff, include the following steps：
S1, magnanimity LTE data when mobile phone carries out pingpang handoff are acquired and are decoded；
S2, the magnanimity LTE data acquired are filtered according to default filter condition；
S3, using different time intervals as pingpang handoff time delay, the magnanimity LTE data after filtering are carried out with table tennis and is cut
Change quantitative statistics；
S4, linear statistical is carried out, and then obtain the separation of pingpang handoff to the pingpang handoff quantized result that statistics obtains；
S5, the separation according to acquisition with reference to the main switch instances taken between cell and adjacent cell, carry out pingpang handoff ginseng
Number adjustment.
Preferred embodiment is further used as, filter condition is preset described in the step S2 is：Using pingpang handoff
Filter condition set by least one of time delay, pingpang handoff number and pingpang handoff accounting parameter.
Preferred embodiment is further used as, the step S3 is specially：
Different time intervals is respectively adopted, as pingpang handoff time delay, rattles to the magnanimity LTE data after filtering
The quantitative statistics of switching times and pingpang handoff accounting.
It is further used as preferred embodiment, the step S4, including：
S41, using pingpang handoff time delay as abscissa, and the pingpang handoff quantized result obtained will be counted as vertical seat
Mark draws change curve；
Separation of the slope-inversion point as pingpang handoff on S42, acquisition change curve.
It is further used as preferred embodiment, the step S5, including：
S51, magnanimity LTE data are parsed, and then judges main to take whether cell switches between fixed adjacent cell
Frequently, if so, performing step S53, otherwise, step S52 is performed；
S52, the separation according to acquisition terminate after the handover trigger time parameter for the cell-level for adjusting pingpang handoff；
S53, the adjacent cell individual character offset parameter for adjusting minizone.
It is further used as preferred embodiment, it is further comprising the steps of after the step S5：
S6, the pingpang handoff parameter after adjustment is updated to LTE system, line trace of going forward side by side.
Preferred embodiment is further used as, the step S6 is specially：
After the pingpang handoff parameter update to LTE system after adjustment, the network performance index of LTE system is obtained, is judged
Whether the fluctuation range of acquired network performance index is in predetermined threshold value section, if then expression parameter adjustment is excessive,
Pingpang handoff parameter adjustment is re-started, otherwise is terminated.
It elaborates below in conjunction with specific embodiment to the present invention.
Embodiment one
LTE switchings include handover measurement, handover decisions and switching and perform three phases.Measuring phases, UE is according to eNodeB
The measuring configuration message issued carries out measurement of correlation, and measurement result is reported to eNodeB.Decision phase, eNodeB is according to UE
The measurement result reported is assessed, and decides whether triggering switching.Execution stage, eNodeB are cut according to the result of decision, control UE
Target cell is changed to, completes to switch by UE.Entire switching flow employs the thinking of UE auxiliary network controls, that is, measure issue,
Measurement is reported, is adjudicated, resource prepares, perform, original resource discharges 6 steps.
The purpose of switching is the continuity in order to keep in communication, but excessively frequently switching may cause under network performance
Drop, signaling traffic load is excessively high, and user perceives the problems such as declining, and how to obtain the reasonable interval of a pingpang handoff time delay, both may be used
To ensure network performance, and signaling traffic load and effective guarantee user perceptibility can be reduced, be exactly the original intention of this method design.
The execution step of the present embodiment is as follows：
With reference to Fig. 1, a kind of optimization method of LTE system pingpang handoff includes the following steps：
S1, magnanimity LTE data when mobile phone carries out pingpang handoff are acquired and are decoded；After decoding, correspondingly deposited
Storage ensures the quality of data, so that later stage operation can be accurate.
S2, the magnanimity LTE data acquired are filtered according to default filter condition；The default filter condition is：
Using the filter condition set by least one of pingpang handoff time delay, pingpang handoff number and pingpang handoff accounting parameter.
S3, different time intervals are respectively adopted 1 second, 2 seconds, n seconds 3 seconds ..., as pingpang handoff time delay, after filtering
Magnanimity LTE data carry out the quantitative statistics of pingpang handoff number and pingpang handoff accounting.
S4, linear statistical is carried out, and then obtain the separation of pingpang handoff to the pingpang handoff quantized result that statistics obtains；
Step S4, including S41 and S42：
S41, using pingpang handoff time delay as abscissa, and the pingpang handoff quantized result obtained will be counted as vertical seat
Mark draws change curve；
Separation of the slope-inversion point as pingpang handoff on S42, acquisition change curve.
S5, the separation according to acquisition with reference to the main switch instances taken between cell and adjacent cell, carry out pingpang handoff ginseng
Number adjustment；
After obtaining separation, corresponding pingpang handoff parameter adjustment need to be carried out, this is more leveled off to the time for ensureing switching
The time of a inflection point, the process of adjustment need to carry out corresponding parameter modification according to the true switch instances of cell, as cell with
The switching of periphery adjacent area is all relatively more frequent, needs to adjust cell-level parameter（TTT）, if cell is more frequent to switching, need to adjust
Minizone parameter（Ocn）.Adjust cell-level parameter（TTT）When be adjusted according to step-length, such as be adjusted to from 320ms
640ms, 1280ms etc. adjust minizone parameter（Ocn）It is to be adjusted according to the section gap of setting, such as from 0dB tune
Whole is -2dB, -4dB etc..
Specifically, step S5, including S51 ~ S53：
S51, magnanimity LTE data are parsed, and then judges main to take whether cell switches between fixed adjacent cell
Frequently, if so, performing step S53, otherwise, step S52 is performed；
S52, the separation according to acquisition terminate after the handover trigger time parameter for the cell-level for adjusting pingpang handoff；
S53, the adjacent cell individual character offset parameter for adjusting minizone.
S6, the pingpang handoff parameter after adjustment is updated to LTE system, line trace of going forward side by side, specially：By the table tennis after adjustment
After the update to LTE system of pang handoff parameter, the network performance index of LTE system is obtained, judges acquired network performance index
Fluctuation range whether in the predetermined threshold value section, if then expression parameter adjustment is excessive, re-start pingpang handoff parameter
Adjustment, on the contrary terminate.
Step S6 carries out the index tracking after parameter adjustment, avoids parameter adjustment excessive, network performance is caused to fluctuate, influence
User perceives.
Embodiment two
The present embodiment is a specific embodiment of embodiment one：
Different time intervals are respectively adopted 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, as pingpang handoff time delay, after filtering
Magnanimity LTE data carry out pingpang handoff number and the quantitative statistics of pingpang handoff accounting.
Quantitative statistics data one：Pingpang handoff time delay 1m, filter condition are：Pingpang handoff number>5, pingpang handoff accounting>
10%, the quantitative statistics in 1 second are obtained as a result, quantitative statistics result here refers to that the summation of pingpang handoff number is 36683；
Quantitative statistics data two：Pingpang handoff time delay 2m, filter condition are：Pingpang handoff number>5, pingpang handoff accounting>
10%, the summation for obtaining the pingpang handoff number in 2 seconds is 138119；
Quantitative statistics data three：Pingpang handoff time delay 3m, filter condition are：Pingpang handoff number>5, pingpang handoff accounting>
10%, the summation for obtaining the pingpang handoff number in 3 seconds is 193422；
Quantitative statistics data four：Pingpang handoff time delay 4m, filter condition are：Pingpang handoff number>5, pingpang handoff accounting>
10%, the summation for obtaining the pingpang handoff number in 4 seconds is 228423；
Quantitative statistics data five：Pingpang handoff time delay 5m, filter condition are：Pingpang handoff number>5, pingpang handoff accounting>
10%, the summation for obtaining the pingpang handoff number in 5 seconds is 254510；
It is as shown in Figure 2 according to the change curve that above-mentioned 5 statistical data are drawn.By can be seen that in Fig. 2, slope turns
Point is that pingpang handoff time delay is position at 2s.Therefore, the corresponding pingpang handoff parameter tune that carries out is whole, then puies forward amending advice
Network optimization center is handed over to be handled, row index of going forward side by side variation observation including network performance and switching index, avoids net after modification parameter
Network hydraulic performance decline influences user's perception.
During data analysis, it is found that part website pingpang handoff accounting is high, website close quarters are generally present in, by this feelings
Condition is known as single cell switching, in addition, pingpang handoff accounting is higher between the adjacent area pair of part, such case is known as cell to cutting
It changes.
It is that front and rear analysis of statistical data result such as the following table 1 is optimized to the switching of single cell using 2s pingpang handoffs time delay
It is shown：
Table 1
Front and rear analysis of statistical data result such as the following table 2 optimizes switching to cell using 2s pingpang handoffs time delay
It is shown：
Table 2
It can be seen that this method can quantify pingpang handoff and carry out parameter optimization adjustment, and optimum results are good,
Reliability is high and stability is high.
It should be noted that the pingpang handoff of not all discovery is required for adjusting, some scenes such as subway needs to protect
Card is such to be switched, increase the problems such as to prevent drop rate, therefore for the accuracy for ensureing parameter adjustment, in parameter adjustment
During need to increase some additional conditions, ensure that this cell portion is centainly carried out parameter again by what pingpang handoff was affected
Adjustment.Such as set following filter condition：
Scheme 1（Cell parameter adjusts）
Filter condition 1：Switching adjacent area of the table tennis ratio more than 20% is to quantity>10；
Filter condition 2：Adjacent area of the table tennis ratio more than 20% is to accounting>30%；
The purpose of this programme filter condition 1 is the coverage screened to adjacent area, and the purpose of filter condition 2 is screening table tennis
The influence proportion of switching.
Scheme 2（Cell is to parameter adjustment）
Filter condition 1：Pingpang handoff number is more than 500；
Filter condition 2：Table tennis ratio is more than 20%；
Filter condition 3：Cell-of-origin pingpang handoff is only present in individual cells pair；
The purpose of this programme filter condition 1,2 is the influence proportion for filtering out cell to pingpang handoff, the mesh of filter condition 3
Be to screen the influence frequency of the cell to pingpang handoff.
It is that the preferable of the present invention is implemented to be illustrated, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations under the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (7)
1. a kind of optimization method of LTE system pingpang handoff, which is characterized in that include the following steps：
S1, magnanimity LTE data when mobile phone carries out pingpang handoff are acquired and are decoded；
S2, the magnanimity LTE data acquired are filtered according to default filter condition；
S3, using different time intervals as pingpang handoff time delay, pingpang handoff amount is carried out to the magnanimity LTE data after filtering
Change statistics；
S4, linear statistical is carried out, and then obtain the separation of pingpang handoff to the pingpang handoff quantized result that statistics obtains；
S5, the separation according to acquisition with reference to the main switch instances taken between cell and adjacent cell, carry out pingpang handoff parameter tune
It is whole.
A kind of 2. optimization method of LTE system pingpang handoff according to claim 1, which is characterized in that the step S2
Described in preset filter condition be：Using at least one of pingpang handoff time delay, pingpang handoff number and pingpang handoff accounting
Filter condition set by parameter.
3. a kind of optimization method of LTE system pingpang handoff according to claim 1, which is characterized in that the step S3,
It is specially：
Different time intervals is respectively adopted, as pingpang handoff time delay, pingpang handoff is carried out to the magnanimity LTE data after filtering
The quantitative statistics of number and pingpang handoff accounting.
4. a kind of optimization method of LTE system pingpang handoff according to claim 1, which is characterized in that the step S4,
Including：
S41, using pingpang handoff time delay as abscissa, and by count obtain pingpang handoff quantized result as ordinate, paint
Change curve processed；
Separation of the slope-inversion point as pingpang handoff on S42, acquisition change curve.
5. a kind of optimization method of LTE system pingpang handoff according to claim 1, which is characterized in that the step S5,
Including：
S51, magnanimity LTE data are parsed, so judge it is main take cell whether switch between fixed adjacent cell it is frequent,
If so, performing step S53, otherwise, step S52 is performed；
S52, the separation according to acquisition terminate after the handover trigger time parameter for the cell-level for adjusting pingpang handoff；
S53, the adjacent cell individual character offset parameter for adjusting minizone.
A kind of 6. optimization method of LTE system pingpang handoff according to claim 1, which is characterized in that the step S5
Later, it is further comprising the steps of：
S6, the pingpang handoff parameter after adjustment is updated to LTE system, line trace of going forward side by side.
7. a kind of optimization method of LTE system pingpang handoff according to claim 6, which is characterized in that the step S6,
It is specially：
After the pingpang handoff parameter update to LTE system after adjustment, the network performance index of LTE system is obtained, judges to be obtained
Whether the fluctuation range of the network performance index taken is in predetermined threshold value section, if then expression parameter adjustment is excessive, again
Pingpang handoff parameter adjustment is carried out, otherwise is terminated.
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| CN107690150A (en) * | 2016-08-05 | 2018-02-13 | 中兴通讯股份有限公司 | With reference to cell quality and the mobile robustness optimization method and device of switch failure |
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| CN102209338A (en) * | 2011-06-10 | 2011-10-05 | 北京邮电大学 | Switching self-optimizing method for mobile communication network |
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| CN102098712A (en) * | 2011-03-24 | 2011-06-15 | 东南大学 | Handoff parameter self-optimization method in mobile communication system |
| CN102209338A (en) * | 2011-06-10 | 2011-10-05 | 北京邮电大学 | Switching self-optimizing method for mobile communication network |
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