CN105357721B - Neighbor cell detecting method and device - Google Patents
Neighbor cell detecting method and device Download PDFInfo
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- CN105357721B CN105357721B CN201410369369.XA CN201410369369A CN105357721B CN 105357721 B CN105357721 B CN 105357721B CN 201410369369 A CN201410369369 A CN 201410369369A CN 105357721 B CN105357721 B CN 105357721B
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Abstract
The present invention relates to a kind of neighbor cell detecting method and devices.This method is to execute in mobile terminal side and the following steps are included: set the frequency point for needing to carry out adjacent area detection；Primary synchronization signal detection is carried out on the frequency point, obtains primary synchronization signal court verdict；Secondary synchronization signal detection is carried out to the primary synchronization signal court verdict, obtains secondary synchronization signal testing result；According to the primary synchronization signal court verdict and the secondary synchronization signal testing result, cell identification number and cell timing are obtained；And it is signal quality measured to the time domain data progress of selected subframe according to the cell identification number and cell timing, to judge whether corresponding cell is empty inspection cell.
Description
Technical field
The present invention relates to mobile communication system, more particularly, to a kind of neighbor cell detecting method and device.
Background technique
Mobile terminal needs to carry out adjacent area detection and nearby region measurement in some cycles, after being after some cell is resident
Continuous cell switching and gravity treatment provide foundation.Adjacent area detection is realized generally by the detection to synchronization signal.LTE(Long
Term Evolution, long term evolution) it is by 3GPP (The 3rd Generation Partnership Project, third
For partner program) and the UMTS that organizes to set up (Universal Mobile Telecommunications System, it is general
Mobile communication system) technical standard long term evolution.LTE standard includes two kinds of standards of FDD-LTE and TDD-LTE at present, i.e. frequency
Divide duplexing LTE system and time division duplex LTE system.It is by detecting primary synchronization signal (Primary in LTE system
Synchronization Signal, PSS) and secondary synchronization signal (Secondary Synchronization Signal, SSS)
To realize adjacent area detection.
Fig. 1 illustrates the time-frequency location of PSS signal and SSS signal in TD-LTE system.Pass through the available neighbour of PSS signal
Area's 10ms frame timing obtains adjacent area nid2；By the available adjacent area 5ms frame timing of SSS signal, adjacent area nid1 is obtained；Pass through
The available adjacent area identification code (ID) of the value of nid2 and nid1.
Fig. 2 shows the method flows of existing adjacent area detection.As shown in Fig. 2, the process includes setting frequency point 201, PSS detection
202 and SSS&CP detection 203.
PSS detection 202 is by n1A 5ms receives data and carries out PSS correlation blob detection, obtains PSS timing and nid2.By
PSS relevant peaks are poor under weak letter, so needing to n1The PSS relevant peaks of a 5ms merge, and guarantee PSS under weak letter environment
Detection performance.
SSS detection 203 is by n2A 5ms receives data and carries out SSS correlation blob detection, obtains 5ms frame timing and nid1.
Also due to SSS relevant peaks are poor under weak letter environment, it is also desirable to n2The SSS relevant peaks of a 5ms merge.
It can be obtained by adjacent area cell ID and adjacent area timing after completing PSS detection and SSS detection.
Since the relevant peaks of PSS and SSS under weak letter environment are poor, in order to guarantee performance that adjacent area under weak letter is detected, need compared with
Big n1And n2, i.e. associated numbers of times can be larger.And biggish relevant peaks number can then mean that adjacent area detection time is long, power consumption is big.
In order to reduce adjacent area detection time, the prior art trades off between adjacent area detection time and detection performance.Example
If the first prior art is to reduce n1And n2While maintain cell detection decision threshold, with reduce to a certain degree it is weak letter or
Cell detection performance under big homogeneous-frequency adjacent-domain interference is cost, reduces adjacent area detection time.Second of prior art is to reduce
n1And n2While reduce cell detection decision threshold, to increase adjacent area probability of false detection as cost, reduce adjacent area detection time.
For second of prior art, adjacent area erroneous detection will not eventually become problem, and reason is mobile terminal subsequent
The adjacent area ID detected will be will use in process and read base station broadcast information.If discovery at this time can not read base station broadcast letter
Breath, then will be considered that this adjacent area is erroneous detection cell.But, correcting this problem dependent on follow-up process means that mobile terminal exists
Time and power consumption are unnecessarily taken in erroneous detection cell.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of neighbor cell detecting method and devices, when reducing adjacent area detection
Between, while improving the reliability of detection.
The present invention is to move to solve above-mentioned technical problem and the technical solution adopted is that propose a kind of neighbor cell detecting method
Dynamic terminal side executes, and the described method comprises the following steps: setting needs to carry out the frequency point of adjacent area detection；It is carried out on the frequency point
Primary synchronization signal detection, obtains primary synchronization signal court verdict；Secondary synchronization signal is carried out to the primary synchronization signal court verdict
Detection, obtains secondary synchronization signal testing result；According to the primary synchronization signal court verdict and secondary synchronization signal detection knot
Fruit obtains cell identification number and cell timing；And according to the cell identification number and cell timing to the time domain of selected subframe
Data progress is signal quality measured, to judge whether corresponding cell is empty inspection cell.
In one embodiment of this invention, it intercepts according to the cell identification number and cell timing or receives some again
The time domain data progress of subframe is signal quality measured, to judge that the step of whether corresponding cell is empty inspection cell is to obtain signal
Time domain signal-to-noise ratio, judge whether respective cell is that empty inspection is small according to the comparison result of the time domain signal-to-noise ratio and a decision threshold
Area.
In one embodiment of this invention, it intercepts according to the cell identification number and cell timing or receives some again
The time domain data progress of subframe is signal quality measured, to judge that the step of whether corresponding cell is empty inspection cell includes: docking
It receives data and carries out Fast Fourier Transform；Shift to an earlier date the frequency domain data at cell special reference according to cell identification number；According to
The frequency domain data and the local reference signal progress channel estimation in frequency domain generated by the cell ID；Frequency domain channel is estimated
It counts result and carries out fast Fourier inverse transformation, obtain time domain channel impulse response；According to the time domain channel impulse response computation
Time domain channel taps power and time domain signal-to-noise ratio；And judged according to the comparison result of the time domain signal-to-noise ratio and a decision threshold
Whether respective cell is empty inspection cell.
In one embodiment of this invention, it intercepts according to the cell identification number and cell timing or receives some again
The time domain data progress of subframe is signal quality measured, to judge that the step of whether corresponding cell is empty inspection cell is to obtain signal
Mean power, judge whether respective cell is empty to examine cell according to the comparison result of the mean power and a decision threshold.
In one embodiment of this invention, it intercepts according to the cell identification number and cell timing or receives some again
The time domain data progress of subframe is signal quality measured, to judge that the step of whether corresponding cell is empty inspection cell includes: docking
It receives data and carries out Fast Fourier Transform；Shift to an earlier date the frequency domain data at cell special reference according to cell identification number；According to
The frequency domain data and the local reference signal progress channel estimation in frequency domain generated by the cell ID；Calculate frequency domain channel
The average value of estimated result；Calculate the power of the average value；According to the power of the average value compared with a decision threshold
As a result judge whether respective cell is empty inspection cell.
In one embodiment of this invention, the selected subframe is according to the cell identification number and cell timing from having connect
Receive the subframe intercepted in data.
In one embodiment of this invention, the selected subframe is to be connect again according to the cell identification number and cell timing
The subframe of receipts.
It in one embodiment of this invention, further include according to time domain channel taps function if respective cell is true cell
Rate obtains the accurate timing IRT value of respective cell, and updates cell timing.
In one embodiment of this invention, the mobile terminal supports TDD-LTE standard and/or FDD-LTE standard.
The present invention also proposes a kind of adjacent area detection device, is included in a mobile terminal, described device includes: for setting
Need to carry out the module of the frequency point of adjacent area detection；For carrying out primary synchronization signal detection on the frequency point, main synchronous letter is obtained
The module of number court verdict；For carrying out secondary synchronization signal detection to the primary synchronization signal court verdict, auxiliary synchronous letter is obtained
The module of number testing result；For obtaining according to the primary synchronization signal court verdict and the secondary synchronization signal testing result
The module of cell identification number and cell timing；And for according to the cell identification number and cell timing to selected subframe when
Numeric field data progress is signal quality measured, to judge whether corresponding cell is the empty module for examining cell.
The present invention is due to further carrying out cell signal quality survey to examined cell after completing traditional adjacent area detection
Amount, the reliability of examined cell can be further judged according to measured value, exclude empty inspection cell.Have benefited from effectively excluding
Fall spurious cell, the present invention improves the reliability of adjacent area detection, can reduce cell while reducing and receiving data times
Detection threshold, to reduce adjacent area detection time and adjacent area detection power consumption.
Detailed description of the invention
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates, in which:
Fig. 1 shows PSS signal and SSS signal in TD-LTE system.
Fig. 2 shows the method flows of the existing adjacent area of LTE system detection.
Fig. 3 shows the neighbor cell detecting method process of one embodiment of the invention.
Fig. 4 shows the cell signal quality measured method flow of one embodiment of the invention.
Fig. 5 shows the cell signal quality measured method flow of another embodiment of the present invention.
Specific embodiment
Fig. 3 shows the neighbor cell detecting method process of one embodiment of the invention.This neighbor cell detecting method is in mobile terminal
Side executes.For example, mobile terminal may include that mobile phone, tablet computer, portable data terminals etc. support mobile communications network
Electronic equipment.
Refering to what is shown in Fig. 3, method includes the following steps:
Step 301, setting needs to carry out the frequency point of adjacent area detection.
In step 302, PSS detection is carried out on frequency point, obtains PSS court verdict.
Specifically, the data of n 5ms can be received in this step, and the PSS relevant peaks of n 5ms are merged.It is right
Result after merging carries out PSS judgement, obtains PSS court verdict.
In step 303, SSS detection is carried out to PSS court verdict, obtains SSS testing result.
Cell identification number (ID) and cell timing are obtained according to PSS court verdict and SSS testing result in step 304.
In step 305, cell identification number and cell timing carry out signal quality measured, root to the time domain data of selected subframe
Judge whether corresponding cell is empty inspection cell according to measurement result.
In one embodiment of this invention, selected subframe can be intercepted from data accepted.In another reality of the invention
It applies in example, selected subframe can be received again and be obtained.
The present embodiment after completing conventional adjacent area detection 301-304, step 305 additionally for cell detected into
Row is signal quality measured, and the reliability of examined cell can be further judged according to cell signal quality measured values, excludes empty inspection
Cell.Due to can effectively exclude spurious cell, the present embodiment, which allows to reduce cell while reducing and receiving data times, to be examined
Survey thresholding since thus achieve the purpose that reduce adjacent area detection time and adjacent area detection power consumption, and will not reduce adjacent area detection
Reliability.Specifically, the frequency n of the reception data in step 302 can reduce, and the decision threshold that SSS is detected in step 303
Also it can reduce.
In contrast, cell detection thresholding is reduced while reducing and receiving data times according to existing method, then needed
Spurious cell can be just found in follow-up process, consume processing time and the power consumption of mobile terminal.
In step 305, signal quality measured index can have several selections.In one embodiment, it can be used
Time domain signal-to-noise ratio (Signal Noise Ratio, SNR) is as signal quality measured index.By time domain SNR and a decision gate
Limit compares, if time domain SNR is greater than or equal to the decision threshold, shows that examined cell is true cell, and cell detection is successful,
Conversely, then showing that examined cell is empty inspection cell, cell detection failure.In one embodiment, mean power work can be used
For signal quality measured index.By mean power compared with a decision threshold, if mean power is greater than or equal to the judgement
Thresholding then shows that examined cell is true cell, cell detection success, conversely, then showing that examined cell is empty inspection cell, cell
Detection failure.
Fig. 4 shows the cell signal quality measured method flow of one embodiment of the invention.Refering to what is shown in Fig. 4, process includes
Following steps.
In step 401, received time domain data is Fast Fourier Transform (Fast Fourier to interception or again
Transformation,FFT)；
In step 402, cell special reference (Cell-specific is extracted according to detected cell ID
Reference signals, CRS) at frequency domain data.
It is represented by this frequency domain dataWherein r, p, l respectively indicate receiving antenna number, sending port number and
The time domain index number of CRS.
In step 403, frequency domain channel is carried out according to frequency domain data and the local reference signal generated by cell ID and is estimated
Meter.
For example, local reference signal is represented byWherein p, l respectively indicate sending port number and CRS when
Domain Index number.
The method of channel estimation in frequency domain for example can be least square (Least Square, LS) estimation, therefore basisWithObtain LS estimated valueSpecific calculating process are as follows:
In step 404, fast Fourier inverse transformation (Inverse Fast Fourier is carried out to channel estimation in frequency domain result
Transformation, IFFT), obtain time domain channel impulse response.
Thus obtained time domain channel shock response is expressed as h(r,l,p), wherein
In step 405, according to time domain channel impulse response computation time domain channel taps power and time domain SNR.
Specifically time domain channel taps power is expressed as p(r,l,p), wherein
p(r,l,p)=| h(r,l,p)|2。
According to time domain channel taps power p(r,l,p)Calculate time domain SNR, specific calculation are as follows:
To p(r,l,p)In last NnA point sums to obtain noise in time domain power
To p(r,l,p)Middle maximum NsA point sums to obtain time-domain signal power
Calculate time domain SNR
Select maximum ρ(r,l,p)As final time domain SNR value
In step 406, empty inspection cell is judged whether it is according to the comparison result of time domain SNR and a decision threshold.
Judgment basis are as follows: if time domain SNR ρ >=ρTHThen cell detection success, otherwise it is assumed that the cell is empty inspection cell, cell
Detection failure, ρTHFor decision threshold.
Fig. 5 shows the cell signal quality measured method flow of another embodiment of the present invention.Refering to what is shown in Fig. 5, process packet
It includes:
In step 501, received time domain data is Fast Fourier Transform (Fast Fourier to interception or again
Transformation,FFT)；
In step 502, the frequency domain data at CRS is extracted according to detected cell ID.
It is represented by this frequency domain dataWherein r, p, l respectively indicate receiving antenna number, sending port number
With the time domain index number of CRS.
In step 503, frequency domain channel is carried out according to frequency domain data and the local reference signal generated by cell ID and is estimated
Meter.
For example, local reference signal is represented byWherein p, l respectively indicate sending port number and CRS when
Domain Index number.
The method of channel estimation in frequency domain for example can be LS estimation, therefore basisWithObtain LS estimated valueSpecific calculating process are as follows:
In step 504, the average value of LS estimated result is calculated.
Specifically, calculating N number ofAverage value,
In step 505, the power of average value is calculated.
Specifically, calculatingPower
It selects maximum as final output power
In step 506, empty inspection cell is judged whether it is according to the comparison result of mean power and a decision threshold.Specifically
It says, if pow >=powth, then it is assumed that otherwise cell detection success examines cell, pow for voidthFor decision threshold.
Due to the phenomenon that being likely to occur timing lead and lag by the cell timing of PSS and SSS acquisition, and to OFDM
For (LTE system OFDM) system, then when timing lags, the measured value accuracy that is obtained using the method for frequency domain measurement compared with
Difference.Channel estimation in frequency domain result is first transformed to time domain by the above embodiment of the present invention, then does the survey of time domain SNR and power again
Amount, can be improved the accuracy of measured value.
In a preferred embodiment, it can also directly obtain timing value in cell signal quality measured process and update and determine
When.
It, after step 405, can be according to time domain channel taps power with reference to embodiment illustrated in fig. 4It is somebody's turn to do
The accurate timing IRT value of cell.Specific calculation can are as follows:
It indicatesThe corresponding position of middle maximum value, r0,l0,p0For the corresponding reception of ρ value
Antenna number, time domain index number and sending port number.
And if judging cell in step 406 for true cell, cell timing is updated according to IRT value.And it is possible to handle
Updated timing is reported or is saved, so as to the use of subsequent nearby region measurement.
Therefore, above-described embodiment can directly obtain timing value and more in the case where not increasing computation complexity substantially
New timing, keeps the timing value of examined cell more acurrate.
The embodiment of the present invention can be adapted for the mobile terminal of LTE standard, more specifically, can simultaneously TD-LTE standard
With the mobile terminal of FDD-LTE standard.
The above embodiment of the present invention further carries out cell signal to examined cell after completing traditional adjacent area detection
Mass measurement can further judge the reliability of examined cell according to measured value, exclude empty inspection cell.Having benefited from can be effective
Ground excludes spurious cell, and the embodiment of the present invention can reduce cell detection thresholding while reducing and receiving data times,
To achieve the purpose that reduce adjacent area detection time and adjacent area detection power consumption.In addition, the above embodiment of the present invention can surveyed
Again cell timing information is updated during amount, guarantees that detection cell timing is more reliable.
Although the present invention is described with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to illustrate the present invention, can also make in the case where no disengaging spirit of that invention
Various equivalent change or replacement out, therefore, as long as to the variation of above-described embodiment, change in spirit of the invention
Type will all be fallen in the range of following claims.
Claims (10)
1. a kind of neighbor cell detecting method is to execute in mobile terminal side, the described method comprises the following steps:
Setting needs to carry out the frequency point of adjacent area detection；
Primary synchronization signal detection is carried out on the frequency point, obtains primary synchronization signal court verdict；
Secondary synchronization signal detection is carried out to the primary synchronization signal court verdict, obtains secondary synchronization signal testing result；
According to the primary synchronization signal court verdict and the secondary synchronization signal testing result, obtains cell identification number and cell is fixed
When；And
It is signal quality measured to the time domain data progress of selected subframe according to the cell identification number and cell timing, with judgement pair
Whether the cell answered is empty inspection cell.
2. the method as described in claim 1, which is characterized in that according to the cell identification number and cell timing interception or again
The time domain data progress for newly receiving some subframe is signal quality measured, the step of whether corresponding cell is empty inspection cell judged
It is the time domain signal-to-noise ratio for obtaining signal, judges that respective cell is according to the comparison result of the time domain signal-to-noise ratio and a decision threshold
It is no to examine cell to be empty.
3. method according to claim 2, which is characterized in that according to the cell identification number and cell timing interception or again
The time domain data progress for newly receiving some subframe is signal quality measured, the step of whether corresponding cell is empty inspection cell judged
Include:
Fast Fourier Transform is carried out to data are received；
The frequency domain data at cell special reference is extracted according to cell identification number；
Channel estimation in frequency domain is carried out according to the frequency domain data and by the local reference signal that the cell identification number generates；
Fast Fourier inverse transformation is carried out to channel estimation in frequency domain result, obtains time domain channel impulse response；
According to the time domain channel impulse response computation time domain channel taps power and time domain signal-to-noise ratio；And
Judge whether respective cell is empty inspection cell according to the comparison result of the time domain signal-to-noise ratio and a decision threshold.
4. the method as described in claim 1, which is characterized in that according to the cell identification number and cell timing interception or again
The time domain data progress for newly receiving some subframe is signal quality measured, the step of whether corresponding cell is empty inspection cell judged
Be obtain signal mean power, according to the comparison result of the mean power and a decision threshold judge respective cell whether be
Void inspection cell.
5. method as claimed in claim 4, which is characterized in that according to the cell identification number and cell timing interception or again
The time domain data progress for newly receiving some subframe is signal quality measured, the step of whether corresponding cell is empty inspection cell judged
Include:
Fast Fourier Transform is carried out to data are received；
The frequency domain data at cell special reference is extracted according to cell identification number；
Channel estimation in frequency domain is carried out according to the frequency domain data and by the local reference signal that the cell identification number generates；
Calculate the average value of channel estimation in frequency domain result；
Calculate the power of the average value；
Judge whether respective cell is empty inspection cell according to the comparison result of the power of the average value and a decision threshold.
6. the method as described in claim 1, which is characterized in that the selected subframe is according to the cell identification number and cell
The subframe that timing is intercepted from data accepted.
7. the method as described in claim 1, which is characterized in that the selected subframe is according to the cell identification number and cell
Timing received subframe again.
8. method as claimed in claim 5, which is characterized in that further include according to time domain if respective cell is true cell
Channel tap power obtains the accurate timing IRT value of respective cell, and updates cell timing.
9. the method as described in claim 1, which is characterized in that the mobile terminal supports TDD-LTE standard and/or FDD-
LTE standard.
10. a kind of adjacent area detection device is included in a mobile terminal, described device includes:
Need to carry out the module of the frequency point of adjacent area detection for setting；
For carrying out primary synchronization signal detection on the frequency point, the module of primary synchronization signal court verdict is obtained；
For carrying out secondary synchronization signal detection to the primary synchronization signal court verdict, the mould of secondary synchronization signal testing result is obtained
Block；
For according to the primary synchronization signal court verdict and the secondary synchronization signal testing result, obtaining cell identification number and small
The module of area's timing；And
It is signal quality measured for being carried out according to the cell identification number and cell timing to the time domain data of selected subframe, to sentence
Whether corresponding cell of breaking is the empty module for examining cell.
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| CN201410369369.XA CN105357721B (en) | 2014-07-30 | 2014-07-30 | Neighbor cell detecting method and device |
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| CN108307408B (en) * | 2017-01-11 | 2023-03-14 | 中兴通讯股份有限公司 | Detection method, device and base station for recognizing false detection caused by interference |
| CN111294826B (en) * | 2019-02-28 | 2022-09-30 | 展讯通信（上海）有限公司 | Cell detection method and device, storage medium and terminal |
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| CN102282893A (en) * | 2009-01-15 | 2011-12-14 | 瑞典爱立信有限公司 | Method and apparatus for cell searching |
| CN102510566A (en) * | 2011-11-30 | 2012-06-20 | 合肥东芯通信股份有限公司 | Method and device for searching neighbor-cell of LTE (long term evolution) system |
| CN103856956A (en) * | 2012-11-29 | 2014-06-11 | 重庆重邮信科通信技术有限公司 | LTE system cell detection method |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102282893A (en) * | 2009-01-15 | 2011-12-14 | 瑞典爱立信有限公司 | Method and apparatus for cell searching |
| CN102510566A (en) * | 2011-11-30 | 2012-06-20 | 合肥东芯通信股份有限公司 | Method and device for searching neighbor-cell of LTE (long term evolution) system |
| CN103856956A (en) * | 2012-11-29 | 2014-06-11 | 重庆重邮信科通信技术有限公司 | LTE system cell detection method |
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