CN104579415B - Cell searching device and method as well as user equipment - Google Patents
Cell searching device and method as well as user equipment Download PDFInfo
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- CN104579415B CN104579415B CN201310495076.1A CN201310495076A CN104579415B CN 104579415 B CN104579415 B CN 104579415B CN 201310495076 A CN201310495076 A CN 201310495076A CN 104579415 B CN104579415 B CN 104579415B
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Abstract
An embodiment of the invention provides a cell searching device and method as well as user equipment. The cell searching method comprises steps as follows: primary synchronizing signal detection is performed on received signals, and primary synchronizing signal identification and timing are acquired; interference cell information is selected according to a primary synchronizing signal detection result, signals related to the interference cell information are eliminated from the received signals, and the interference cancellation received signals are obtained; the interference cancellation received signals are subjected to primary synchronizing signal detection, and interference cancellation primary synchronizing signal identification and timing are acquired. Through the embodiment of the invention, influence of strong interference in a heterogeneous network environment can be reduced, a weak cell can be detected while a strong cell is detected, the cell searching performance is improved, and the cell searching time is shortened.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of cell search apparatus, method and user equipment.
Background technology
In long evolving system（LTE, Long Term Evolution）In, base station（ENB, eNodeB）Do not set for user
It is standby（UE, User Equipment）The list of adjacent cell information is provided.Therefore, cell switching and cell are carried out in user equipment
During gravity treatment, user equipment to adjacent cell firstly the need of detecting.The purpose of neighbor cell detection is to obtain neighbor cell
Timing information and these cells id information, be that follow-up neighbor cell measurement is prepared.
The search of neighbor cell be based on downlink in two synchronizing signals completing：Master sync signal（PSS,
Primary Synchronous Signal）And auxiliary synchronous signals（SSS, Secondary Synchronous Signal）.Cause
This, current cell searching is broken generally into two stages.First stage is main same so as to obtain mainly for detection of master sync signal
Step signal identification（PSS ID）And field（5ms）Timing（Timing）.On this basis, the detection of second stage is carried out；
The purpose of second stage detection is such as group mark by detecting that auxiliary synchronous signals obtain candidate cell information（Group ID）、
Cyclic Prefix（CP, Cyclic Prefix）Type and frame timing information.
Fig. 1 is a schematic flow sheet of cell searching of the prior art.As shown in figure 1, master sync signal detection is general
It is that the signal that will receive and local PSS signals carry out cross-correlation operation in time domain, to correlation（Correlation）Carry out most
Big value retrieval, obtains PSS ID and the timing information corresponding to maximum.And auxiliary synchronous signals detection can be according to main synchronous letter
The result of number detection, acquisition group mark, cyclic prefix type and frame timing information.
On the other hand, in heterogeneous network, user equipment may all the time in the environment of strong jamming.Fig. 2 is existing skill
A structural representation of heterogeneous network in art, as shown in Fig. 2 Microcell of the user equipment 201 in low transmitting power（Pico
Cell）Under 202, while there is the macrocell of high emission power in neighbor cell（Macro Cell）203.Therefore, user equipment
201 are in all the time in the environment of strong jamming.And cell searching will not only detect strong cell（Macro cell）, and
To detect weak cell simultaneously（Pico cell）.
But, inventor is had found when detecting to small and weak area, Signal Interference and Noise Ratio（SINR, Signal to
Interference plus Noise Ratio）It is low-down.In this case, with the reduction of SINR, traditional is little
Area searching method penalty is very serious, therefore the performance of cell searching is low and search time is long.
It should be noted that the introduction of technical background is intended merely to above it is convenient technical scheme is carried out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be the present invention's
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
The embodiment of the present invention provides a kind of cell search apparatus, method and user equipment.Purpose is to reduce heterogeneous network
Strong jamming is for the impact of cell searching performance under network environment.
One side according to embodiments of the present invention, there is provided a kind of cell search apparatus, the cell search apparatus include：
First main synchronous detection unit, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark
And timing；
Main synchronous interference eliminates unit, the result selection interfered cell information detected using the master sync signal, and from
Eliminate the signal related to the interfered cell information in the reception signal to obtain the reception signal after interference is eliminated；
Second main synchronous detection unit, the reception signal after eliminating to the interference carries out master sync signal detection, to obtain
Master sync signal mark and timing after eliminating must be disturbed.
A kind of other side according to embodiments of the present invention, there is provided small region search method, the small region search method bag
Include：
The docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing；
Using the master sync signal detect result select interfered cell information, and from it is described reception signal in eliminate with
The related signal of the interfered cell information disturbs the reception signal after eliminating to obtain；
Reception signal after eliminating to the interference carries out master sync signal detection, to obtain the main synchronization after interference is eliminated
Signal identification and timing.
A kind of other side according to embodiments of the present invention, there is provided user equipment, the user equipment includes as above institute
The cell search apparatus stated.
The beneficial effects of the present invention is：Interfered cell information is selected after master sync signal is detected and is carried out channel and is estimated
Meter and signal reconstruction, carry out master sync signal inspection again after the signal related to interfered cell information to receive eliminated in signal
Survey, and the input information that the result of master sync signal detection twice or more is detected as auxiliary synchronous signals；Can subtract
Strongly disturbing impact under few heterogeneous network environment, is also capable of detecting when small and weak area while strong cell is detected, improves cell
The performance of search, shortens the time of cell searching.
With reference to explanation hereinafter and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, specify the original of the present invention
Reason can be in adopted mode.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms that profit is required, embodiments of the present invention include many changes, modifications and equivalent.
The feature for describing for a kind of embodiment and/or illustrating can be in same or similar mode one or more
It is combined with the feature in other embodiment used in individual other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but and
It is not excluded for the presence of one or more further features, one integral piece, step or component or additional.
Description of the drawings
Fig. 1 is a schematic flow sheet of cell searching of the prior art；
Fig. 2 is a structural representation of heterogeneous network in prior art；
Fig. 3 is a flow chart of the small region search method of the embodiment of the present invention 1；
Fig. 4 is the another flow chart of the small region search method of the embodiment of the present invention 1；
Fig. 5 is an exemplary plot of the small region search method of the embodiment of the present invention 1；
Fig. 6 is a flow chart of the small region search method of the embodiment of the present invention 2；
Fig. 7 is the flow chart that the signal reconstruction of the embodiment of the present invention 2 and interference are eliminated；
Fig. 8 is the instance graph that the signal reconstruction of the embodiment of the present invention 2 and interference are eliminated；
Fig. 9 is an exemplary plot of the small region search method of the embodiment of the present invention 2；
Figure 10 is another flow chart that the signal reconstruction of the embodiment of the present invention 2 and interference are eliminated；
Figure 11 is another instance graph that the signal reconstruction of the embodiment of the present invention 2 and interference are eliminated；
Figure 12 is a composition schematic diagram of the cell search apparatus of the embodiment of the present invention 3；
Figure 13 is another composition schematic diagram of the cell search apparatus of the embodiment of the present invention 3；
Figure 14 is a composition schematic diagram of the cell search apparatus of the embodiment of the present invention 4；
Figure 15 is the composition schematic diagram that the main synchronous interference of the embodiment of the present invention 4 eliminates unit；
Figure 16 is the composition schematic diagram that the auxiliary synchronous interference of the embodiment of the present invention 4 eliminates unit.
Specific embodiment
Referring to the drawings, by description below, the aforementioned and further feature of the present invention will be apparent from.In specification
In accompanying drawing, only certain exemplary embodiments of this invention is specifically disclosed, which show the portion of the principle that can wherein adopt the present invention
Divide embodiment, it will thus be appreciated that the invention is not restricted to described embodiment, conversely, the present invention includes falling into appended power
Whole modifications, modification and equivalent in the range of profit requirement.
Embodiment 1
The embodiment of the present invention provides a kind of small region search method, and Fig. 3 is the one of the small region search method of the embodiment of the present invention
Flow chart.As shown in figure 3, the small region search method includes：
Step 301, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing；
Step 302, using master sync signal detect result select interfered cell information, and from receive signal in eliminate with
The related signal of interfered cell information disturbs the reception signal after eliminating to obtain；
Step 303, the reception signal after eliminating to interference carries out master sync signal detection, to obtain the master after interference is eliminated
Synchronizing signal is identified and timing.
In the present embodiment, user equipment can be carried out the signal for receiving mutually in time domain with local PSS signals
Close operation to carry out master sync signal detection, it is possible thereby to obtain one or more（For example, K）Master sync signal is identified
And timing（It is referred to as footpath Path）.
It is then possible to select one or more from the result of master sync signal detection（For example, M）Path is used as dry
Disturb cell information.Also, the M Path to selecting is carried out after channel estimation and signal reconstruction, can be from reception signal
Eliminate the signal of these reconstruct（It is related to interfered cell information）To obtain the reception signal after interference is eliminated.
In the present embodiment, the reception signal after eliminating to interference carries out again master sync signal detection, it is possible thereby to obtain
Master sync signal mark and timing after eliminating must be disturbed.Wherein it is possible to carry out main synchronization respectively to the corresponding signal of M Path
Detection, each main synchronous detection obtains one or more（It is for example, N number of）The mark of master sync signal and timing.
In the present embodiment, can be by the master sync signal mark obtained in step 301 and timing（For example, K）, with
And the master sync signal obtained in step 303 is identified and timing（For example, M × N number of）As the input of auxiliary synchronous signals detection.
It should be noted that the part of the master sync signal detection of cell searching is illustrate only in Fig. 3, for auxiliary synchronous letter
The part of number detection, it is possible to use master sync signal mark and timing that step 301 and step 303 are obtained, using existing skill
Art is carrying out.
Thus, interfered cell information is selected after master sync signal detection, is eliminated and interfered cell from receiving in signal
Master sync signal detection, and the result that master sync signal twice is detected are carried out after the related signal of information again as auxiliary synchronization
The input information of signal detection.Strongly disturbing impact under heterogeneous network environment can be reduced, while strong cell is detected
Small and weak area is capable of detecting when, the performance of cell searching is improved, shortens the time of cell searching.
Fig. 4 is the another flow chart of the small region search method of the embodiment of the present invention.As shown in figure 4, the small region search method
Including：
Step 401, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing.
Step 402, using master sync signal detect result select interfered cell information, and from receive signal in eliminate with
The related signal of interfered cell information disturbs the reception signal after eliminating to obtain.
Step 403, the reception signal after eliminating to interference carries out master sync signal detection, to obtain the master after interference is eliminated
Synchronizing signal is identified and timing.
Step 404, judges whether to reach pre-conditioned；Reach it is pre-conditioned in the case of, terminate master sync signal inspection
The stage of survey；Be not reaching to it is pre-conditioned in the case of, execution step 402 and step 403 eliminate carrying out interference again and
Master sync signal is detected.
Step 405, according to twice or more master sync signal obtained master sync signal mark and timing are detected, are carried out
Auxiliary synchronous signals are detected.
In the present embodiment, pre-conditioned can be detection number of times set in advance, search time etc. based on experience value；
Can also be generated according to testing result, for example the difference of the end value of last time detection and the end value of this detection is less than pre-
If value.But the invention is not restricted to this, can be determined according to actual conditions specific pre-conditioned.
In the present embodiment, it is possible to use the result of front single treatment repeats interference and eliminates and master sync signal inspection
Survey.And the input that the result that each master sync signal is detected can be detected as auxiliary synchronous signals, it is possible thereby to further carry
High measurement accuracy, it is to avoid should it is searched to small and weak area situation about being not detected.
Fig. 5 is an exemplary plot of the small region search method of the embodiment of the present invention, shows a case that master sync signal is detected.
As shown in figure 5, first time master sync signal detection can be carried out to signal r (i) for receiving, K Path is obtained；Then can be with
The M Path to selecting carries out signal reconstruction and interference is eliminated, and carries out second master sync signal detection, acquisition M × N number of
Path.Also, by K+（M×N）Individual Path is added in the results list the input information as auxiliary synchronous signals detection.
As shown in figure 5, can be to select Path from the result of second master sync signal detection, to the Path for selecting
Interference elimination is carried out, and carries out third time master sync signal detection, then testing result is added in list；…….Such as Fig. 5
It is shown, be not reaching to it is pre-conditioned in the case of, can repeat interference eliminate and master sync signal detection.
From above-described embodiment, interfered cell information is selected after master sync signal is detected, disappeared in signal from receiving
Except carrying out master sync signal detection after the signal related to interfered cell information again, and by main synchronization twice or more than twice
The input information that the result of signal detection is detected as auxiliary synchronous signals.Strongly disturbing shadow under heterogeneous network environment can be reduced
Ring, be also capable of detecting when small and weak area while strong cell is detected, improve the performance of cell searching, shorten cell searching when
Between.
Embodiment 2
The embodiment of the present invention provides a kind of small region search method, to the main synchronous letter of the present invention on the basis of embodiment 1
Number detection and auxiliary synchronous signals detection be described in detail.Auxiliary synchronous signals detection-phase in the embodiment of the present invention can also enter
Row signal reconstruction and interference are eliminated, and carry out auxiliary synchronous signals detection twice or more than twice.
Fig. 6 is a flow chart of the small region search method of the embodiment of the present invention.As shown in fig. 6, the small region search method bag
Include master sync signal detection-phase 601 and auxiliary synchronous signals detection-phase 602.Wherein master sync signal detection-phase 601 includes：
Step 6011, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing.
In the present embodiment, signal r (n, i) that can be received and local PSS signal PSSreplica(pid) in time domain
Carry out cross-correlation operation.For example using the search window of 5ms, K Path is obtained.
(pidk;ik)=maxK(|corr(r(i),PSSreplica(pid))|)k=0,1,…K-1
Wherein, corr (*) represent the cross-correlation operation carried out in time domain；max(*) represent maximum value search operation.Thus may be used
To detect the timing information of K PSS ID and correlation.
Step 6012, the result detected using master sync signal selects interfered cell information, and eliminates from receiving in signal
The signal related to interfered cell information disturbs the reception signal after eliminating to obtain.
Step 6013, the reception signal after eliminating to interference carries out master sync signal detection, is disturbed after elimination with obtaining
Master sync signal is identified and timing.
In the present embodiment, the result of master sync signal detection can be utilized in step 6012 to carry out interference elimination.Fig. 7 is
The flow chart that the signal reconstruction of the embodiment of the present invention and interference are eliminated, as shown in fig. 7, the interference of the present invention is eliminated can wrap
Include：
Step 701, according to the correlation of master sync signal detection multiple interfered cell informations are selected.
In the present embodiment, selection interfered cell information can be carried out based on the result that master sync signal is detected, for example
The maximum Path of M correlation can be selected from K Path according to correlation（Corresponding to interfered cell information）.(pidm;im)
=maxM(|corr(r(ik),PSSreplica(pidk))|)k=0,1,…K-1;m=0,1,…M-1;M≤K
Step 702, according to the correlation of interfered cell information the method and parameter of channel estimation are selected, and are estimated according to channel
The method and parameter of meter carries out channel estimation to interfered cell information.
In the present embodiment, the method and parameter of channel estimation can be adaptive selected according to correlation.Channel estimation
Method for example can add averaging method including LS channel estimation methods, MMSE method, DTF-Based methods or LS；Channel is estimated
The parameter of meter can for example include smooth length（Smooth Length）, ZF add the linear flat of linear averaging parameter or frequency
Sliding parameter.
By taking LS channel estimation methods and smooth length as an example.For example, if
(|corr(r(im),PSSreplica(pidm))|)-(|corr(r(im+1),PSSreplica(pidm+1))|)>TH0
Wherein, TH0For preset value；Then smooth length J0=20, otherwise J0=30。
It should be noted that above the selection only to how to carry out channel estimation methods and parameter has carried out schematic theory
It is bright, the invention is not restricted to this, specific embodiment can be determined according to actual conditions.
Step 703, signal reconstruction is carried out according to the result of channel estimation to interfered cell information；
Step 704, eliminates the signal related to interfered cell information to obtain connecing after interference is eliminated from receiving in signal
The collection of letters number.
In the present embodiment, for the reconstruct and interference elimination of signal can be carried out in the time domain, for channel estimation etc.
Can in a frequency domain carry out, be illustrated to property illustrated below.
Fig. 8 is the instance graph that the signal reconstruction of the embodiment of the present invention and interference are eliminated, and shows that master sync signal is detected
The situation that signal reconstruction of stage and interference are eliminated.Thus, the reception letter after interference is eliminated can be obtained by above-mentioned steps
Number.Then the reception signal after can eliminating to interference in step 6013 carries out master sync signal detection.
Specifically, the signal r after interference can be eliminatedcancel(n, i) carries out again cross-correlation behaviour with local PSS signals
Make.Wherein, the detection window used in step 6013 is less than the detection window used in step 6011.Such as step 6013
Used in detection window NwinMore than 0 and less than 5ms；For example can be Nwin=Ncp。
(pidn;in)=maxN(|corr(rcancel(i),PSSreplica(pid))|)n=0,1,…N-1;im-Nwin≤i≤im
+Nwin
It should be noted that illustrate only in accompanying drawing 6 carrying out the situation of synchronous detection main twice, but the invention is not restricted to
This.For example, it is identical with the situation shown in Fig. 4, can also arrange pre-conditioned, and carry out main synchronous detection more than twice.
Above for master sync signal detection-phase is illustrated, by master sync signal inspection twice or more than twice
Survey, it is possible to obtain the mark of multiple master sync signals and timing（Path）.Auxiliary synchronous signals detection-phase 602 is said below
It is bright.
As shown in fig. 6, auxiliary synchronous signals detection-phase 602 includes：
Step 6021, according to master sync signal mark and timing auxiliary synchronous signals detection is carried out, to obtain candidate cell letter
Breath；
Step 6022, using candidate cell information interfered cell information is detected, and little from elimination and interference in signal is received
Information related signal in area's disturbs the signal after eliminating to obtain；
Step 6023, the signal after eliminating to interference carries out auxiliary synchronous signals detection, obtains the candidate after interference is eliminated little
Area's information.
It should be noted that illustrate only in accompanying drawing 6 carrying out the situation of synchronous detection auxiliary twice, but the invention is not restricted to
This.For example, it is also possible to arrange pre-conditioned, and carry out auxiliary synchronous detection more than twice.
Fig. 9 is another exemplary plot of the small region search method of the embodiment of the present invention, shows the feelings that auxiliary synchronous signals are detected
Condition.As shown in figure 9, first time auxiliary synchronous signals inspection can be carried out according to the result of PSS detections, signal r (i) to receiving
Survey, obtain multiple candidate cells；Then interference elimination can be carried out to the candidate cell selected, and carries out second auxiliary synchronization
Signal detection, obtains multiple candidate cells.Also, each candidate cell for obtaining is added in candidate list.
As shown in figure 9, can be to select candidate cell from the result of second auxiliary synchronous signals detection, to what is selected
Candidate cell carries out interference elimination, and carries out third time auxiliary synchronous signals detection, then testing result is added to into list
In；…….As shown in figure 9, be not reaching to it is pre-conditioned in the case of, can repeat interference eliminate and auxiliary synchronous signals
Detection.
It is described in detail below for each step of the auxiliary synchronous signals detection as shown in Fig. 6 and Fig. 9.
In step 6021, the mark of the master sync signal that can be obtained according to master sync signal detection-phase 601 and
Regularly（Path）Carry out auxiliary synchronous signals detection.For each candidate Path, can be by the auxiliary synchronous signals for receiving and local SSS
Signal carries out associative operation on frequency domain.
C(cp,gid,frametim)=Corr(ySSS(cp),SSSreplica(gid,frametim))
Wherein, ySSS(cp) be receive auxiliary synchronous signals, can be the auxiliary synchronous signals received after equilibrium；Its
In, equilibrium is to carry out channel estimation to realize according to the result detected using first stage PSS.Can be according to OFDM symbol
Feature detects first CP types；Wherein there are two kinds of CP types in LTE system（Normal CP and Extend CP）.SSSreplica
(gid, frametim) is the local auxiliary synchronous signals generated according to 168 different group ID and 2 kinds of different frame timings.And
Corr(*) cross-correlation operation is represented, specifically how to carry out cross-correlation operation and may be referred to prior art.
It is then possible to the correlation of maximum is retrieved according to the correlation of above-mentioned calculating, and as corresponding to following formula is calculated
Metric：
Wherein average (*) represent that the correlation to all calculating carries out average operation.
Resulting metric is calculated according to above-mentioned, it is compared with default threshold value.If metric is big
In thresholding, then by the { cp for detectingopt,gidopt,frametimoptAs candidate cell.
In step 6022, it is possible to use the result of auxiliary synchronous signals detection carries out interference elimination.Figure 10 is of the invention real
Another flow chart that the signal reconstruction and interference for applying example is eliminated, as shown in Figure 10, the interference of the present invention is eliminated and can included：
Step 1001, according to the correlation of auxiliary synchronous signals detection multiple interfered cells are selected.
In the present embodiment, selection interfered cell information can be carried out based on the result that master sync signal is detected, for example
The maximum interfered cell of L metric can be selected according to metric.
(pidl;il;cpl;gidl;frametiml)=maxL(Γ(cp,gid,frametim,pid,i))l=0,…L-1
Step 1002, according to the metric of interfered cell the method and parameter of channel estimation are selected, and according to channel estimation
Method and parameter channel estimation is carried out to interfered cell.
In the present embodiment, the method and parameter of channel estimation can be adaptive selected according to metric.Channel is estimated
The method of meter for example can add averaging method including LS channel estimation methods, MMSE method, DTF-Based methods or LS；Channel
The parameter of estimation can for example include smooth length（Smooth Length）, ZF add the linear of linear averaging parameter or frequency
Smoothing parameter.
By taking LS channel estimation methods and smooth length as an example.For example, if Γ>TH1, wherein, TH1For preset value；Then smooth
Length J0=20, otherwise J0=30.It should be noted that above the selection only to how to carry out channel estimation methods and parameter is carried out
Schematically illustrate, the invention is not restricted to this, can determine specific embodiment according to actual conditions.
Step 1003, signal reconstruction is carried out according to the result of channel estimation to interfered cell；
Step 1004, eliminates the signal related to interfered cell to obtain the signal after interference is eliminated from receiving in signal.
In the present embodiment, for the reconstruct and interference elimination of signal can be carried out in the time domain, for channel estimation etc.
Can in a frequency domain carry out, be illustrated to property illustrated below.
Wherein, NFFTAnd NcpIt is respectively the size and CP sizes of FFT.
Figure 11 is another instance graph that the signal reconstruction of the embodiment of the present invention and interference are eliminated, and shows that auxiliary synchronous signals are examined
The situation that signal reconstruction of survey stage and interference are eliminated.Thus, the signal after interference is eliminated can be obtained by above-mentioned steps.
Then the signal after can eliminating to interference in step 6023 carries out auxiliary synchronous signals detection.
From above-described embodiment, interfered cell information is selected after master sync signal is detected, disappeared in signal from receiving
Except carrying out master sync signal detection, and the knot that master sync signal twice is detected after the signal related to interfered cell information again
Input information of the fruit as auxiliary synchronous signals detection；Strongly disturbing impact under heterogeneous network environment can be reduced.
Further, interfered cell information is selected after auxiliary synchronous signals detection, eliminate in signal and interference from is received
Auxiliary synchronous signals detection is carried out again after the related signal of cell information, obtains auxiliary synchronous signals detection twice or more than twice
Result；Strongly disturbing impact under heterogeneous network environment can further be reduced.Thus, also can while strong cell is detected
Small and weak area is enough detected, the performance of cell searching is improved, shortens the time of cell searching.
Embodiment 3
The embodiment of the present invention provides a kind of cell search apparatus, corresponding with the small region search method described in embodiment 1, identical
Content repeat no more.
Figure 12 is a composition schematic diagram of the cell search apparatus of the embodiment of the present invention, as shown in figure 12, cell searching dress
Putting 1200 includes：First main synchronous detection unit 1201, main synchronous interference eliminate the main synchronous detection unit of unit 1202 and second
1203。
Wherein, the docking of the first main synchronous detection unit 1201 collection of letters number carries out master sync signal detection, to obtain primary sync
Signal identification and timing；Main synchronous interference eliminates unit 1202 and selects interfered cell letter using the result of master sync signal detection
Breath, and eliminate the signal related to interfered cell information in signal to obtain the reception signal after interference is eliminated from receiving；Second
The signal that receives after the 1203 pairs of interference of main synchronous detection unit are eliminated carries out the detection of master sync signal, is disturbed after elimination with obtaining
Master sync signal mark and timing.
It should be noted that accompanying drawing 12 is not shown the device of auxiliary synchronous signals detection.In the specific implementation, auxiliary synchronous letter
Number detection device can adopt prior art, here is omitted.
Figure 13 is another composition schematic diagram of the cell search apparatus of the embodiment of the present invention, as shown in figure 13, cell searching
Device 1300 includes：It is single that first main synchronous detection unit 1201, main synchronous interference eliminate the main synchronous detection of unit 1202 and second
Unit 1203, as mentioned above.
As shown in figure 13, cell search apparatus 1300 can also include：First judging unit 1304, judges whether to reach pre-
If condition.Also, be not reaching to it is pre-conditioned in the case of, main synchronous interference is eliminated after unit 1202 eliminated using interference
Master sync signal carries out again interference elimination, and the second main synchronous detection unit 1203 carries out again the inspection of master sync signal
Survey, to obtain master sync signal mark and timing after eliminating are disturbed again.
As shown in figure 13, cell search apparatus 1300 can also include：Auxiliary synchronous detection unit 1305, according to main synchronous letter
Number mark and timing carry out the detection of auxiliary synchronous signals.
From above-described embodiment, interfered cell information is selected after master sync signal is detected, disappeared in signal from receiving
Except carrying out master sync signal detection after the signal related to interfered cell information again, and by main synchronization twice or more than twice
The input information that the result of signal detection is detected as auxiliary synchronous signals.Strongly disturbing shadow under heterogeneous network environment can be reduced
Ring, be also capable of detecting when small and weak area while strong cell is detected, improve the performance of cell searching, shorten cell searching when
Between.
Embodiment 4
The embodiment of the present invention provides a kind of cell search apparatus, corresponding with the small region search method described in embodiment 2, identical
Content repeat no more.
Figure 14 is a composition schematic diagram of the cell search apparatus of the embodiment of the present invention, as shown in figure 14, cell searching dress
Putting 1400 includes：First main synchronous detection unit 1201, main synchronous interference eliminate the main synchronous detection unit of unit 1202 and second
1203, as described in Example 3.
As shown in figure 14, cell search apparatus 1400 can also include：First auxiliary synchronous detection unit 1404, auxiliary synchronization are done
Disturb the elimination auxiliary synchronous detection unit 1406 of unit 1405 and second.
Wherein, the first auxiliary synchronous detection unit 1404 carries out auxiliary synchronous signals inspection according to master sync signal mark and timing
Survey, to obtain candidate cell information；Auxiliary synchronous interference eliminates unit 1405 and detects interfered cell information using candidate cell information,
And eliminate the signal related to interfered cell information in signal to obtain the signal after interference is eliminated from receiving；Second auxiliary synchronization
Signal after 1406 pairs of interference of detector unit are eliminated carries out auxiliary synchronous signals detection, obtains the candidate cell letter after interference is eliminated
Breath.
In the present embodiment, cell search apparatus 1400 can also include：First judging unit（Figure 12 is not shown）, judge
Whether reach pre-conditioned.Also, be not reaching to it is pre-conditioned in the case of, main synchronous interference eliminates unit 1202 using dry
Disturbing the master sync signal after eliminating carries out again interference elimination, and the second main synchronous detection unit 1203 carries out again main synchronization
The detection of signal, to obtain master sync signal mark and timing after eliminating are disturbed again.
In the present embodiment, cell search apparatus 1400 can also include：Second judging unit（Figure 12 is not shown）, judge
Whether reach pre-conditioned.Also, be not reaching to it is pre-conditioned in the case of, auxiliary synchronous interference eliminates unit 1405 using dry
Disturbing the candidate cell information after eliminating carries out again interference elimination, and the second auxiliary synchronous detection unit 1406 carries out again auxiliary synchronous letter
Number detection, with obtain again interference eliminate after candidate cell information.
In the present embodiment, cell search apparatus 1400 can also include：Window determining unit（Figure 12 is not shown）, it is determined that
First main synchronous detection unit 1201 and the second main synchronous detection unit 1203 are carrying out search window when master sync signal is detected
Mouthful；The detection window that wherein second main synchronous detection unit 1203 is used is used less than the first main synchronous detection unit 1201
Detection window.
Figure 15 is the composition schematic diagram that the main synchronous interference of the embodiment of the present invention eliminates unit, as shown in figure 15, main same
Step interference cancellation unit 1202 can include：First community select unit 1501, the first channel estimating unit 1502, the first signal
The interference cancellation unit 1504 of reconfiguration unit 1503 and first；
Wherein, first community select unit 1501 selects multiple interfered cell letters according to the correlation that master sync signal is detected
Breath；First channel estimating unit 1502 selects the method and parameter of channel estimation, and root according to the correlation of interfered cell information
Channel estimation is carried out to interfered cell information according to the method and parameter of channel estimation；First signal reconstruction unit 1503 is according to channel
The result of estimation carries out signal reconstruction to interfered cell information；First interference cancellation unit 1504 is eliminated and done from reception signal
Disturb the related signal of cell information to obtain the reception signal after interference is eliminated.
Figure 16 is the composition schematic diagram that the auxiliary synchronous interference of the embodiment of the present invention eliminates unit, as shown in figure 16, auxiliary same
Step interference cancellation unit 1405 can include：Second community select unit 1601, second channel estimation unit 1602, secondary signal
The interference cancellation unit 1604 of reconfiguration unit 1603 and second；
Wherein, second community select unit 1601 selects multiple interfered cells according to the metric that auxiliary synchronous signals are detected；
Second channel estimation unit 1602 selects the method and parameter of channel estimation according to the metric of interfered cell, and is estimated according to channel
The method and parameter of meter carries out channel estimation to interfered cell；Secondary signal reconfiguration unit 1603 according to the result of channel estimation,
Signal reconstruction is carried out to interfered cell；Second interference cancellation unit 1604 eliminates the letter related to interfered cell from reception signal
Number come obtain interference eliminate after signal.
The embodiment of the present invention also provides a kind of user equipment, and the user equipment includes the cell as described in embodiment 3 or 4
Searcher.
From above-described embodiment, interfered cell information is selected after master sync signal is detected, disappeared in signal from receiving
Except carrying out master sync signal detection, and the knot that master sync signal twice is detected after the signal related to interfered cell information again
Input information of the fruit as auxiliary synchronous signals detection；Strongly disturbing impact under heterogeneous network environment can be reduced.
Further, interfered cell information is selected after auxiliary synchronous signals detection, eliminate in signal and interference from is received
Auxiliary synchronous signals detection is carried out again after the related signal of cell information, obtains auxiliary synchronous signals detection twice or more than twice
Result；Strongly disturbing impact under heterogeneous network environment can further be reduced.Thus, also can while strong cell is detected
Small and weak area is enough detected, the performance of cell searching is improved, shortens the time of cell searching.
Apparatus and method more than of the invention can be realized by hardware, it is also possible to be realized by combination of hardware software.The present invention
It is related to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize above
Described device or component parts, or make the logical block realize various methods or step mentioned above.The invention further relates to
For storing the storage medium of procedure above, such as hard disk, disk, CD, DVD, flash memory.
Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, are not limiting the scope of the invention.Those skilled in the art can be according to the present invention
Spirit and principle various variants and modifications are made to the present invention, these variants and modifications are also within the scope of the invention.
With regard to including the embodiment of above example, following note being also disclosed：
（Note 1）A kind of cell search apparatus, the cell search apparatus include：
First main synchronous detection unit, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark
And timing；
Main synchronous interference eliminates unit, the result selection interfered cell information detected using the master sync signal, and from
Eliminate the signal related to the interfered cell information in the reception signal to obtain the reception signal after interference is eliminated；
Second main synchronous detection unit, the reception signal after eliminating to the interference carries out master sync signal detection, to obtain
Master sync signal mark and timing after eliminating must be disturbed.
（Note 2）Cell search apparatus according to note 1, wherein, described device also includes：
Auxiliary synchronous detection unit, the main synchronization after being eliminated according to master sync signal mark and timing and the interference
Signal identification and timing, carry out auxiliary synchronous signals detection.
（Note 3）Cell search apparatus according to note 1, wherein, described device also includes：
First judging unit, judges whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, the master after the interference cancellation unit is eliminated using interference is same
Step signal carries out again interference elimination, and the second main synchronous detection unit carries out again master sync signal detection, to obtain
Obtain master sync signal mark and timing after again interference is eliminated.
（Note 4）Cell search apparatus according to note 1, wherein, the main synchronous interference eliminates unit to be included：
First community select unit, according to the correlation of master sync signal detection multiple interfered cell informations are selected；
First channel estimating unit, according to the correlation of the interfered cell information method and ginseng of channel estimation are selected
Number, and channel estimation is carried out to the interfered cell information according to the method and parameter of the channel estimation；
First signal reconstruction unit, signal reconstruction is carried out according to the result of channel estimation to the interfered cell information；
First interference cancellation unit, from the reception signal signal related to the interfered cell information is eliminated, and is come
Obtain the reception signal after interference is eliminated.
（Note 5）Cell search apparatus according to note 4, wherein, the method for the channel estimation includes LS channels
Method of estimation, MMSE method, DTF-Based methods or LS add averaging method；The parameter of the channel estimation includes smooth length
Degree, ZF add the linear smoothing parameter of linear averaging parameter or frequency.
（Note 6）Cell search apparatus according to note 1, wherein, described device also includes：
Window determining unit, determines that the described first main synchronous detection unit and the second main synchronous detection unit are being carried out
Search window when master sync signal is detected；The detection window that wherein described second main synchronous detection unit is used is less than described
The detection window that first main synchronous detection unit is used.
（Note 7）Cell search apparatus according to note 2, wherein, the auxiliary synchronous detection unit includes：
First auxiliary synchronous detection unit, according to master sync signal mark and timing auxiliary synchronous signals detection is carried out, to obtain
Candidate cell information；
Auxiliary synchronous interference eliminates unit, and using the candidate cell information interfered cell information is selected, and from reception signal
It is middle to eliminate the signal related to the interfered cell information to obtain the signal after interference is eliminated；
Second auxiliary synchronous detection unit, the signal after eliminating to the interference carries out auxiliary synchronous signals detection, is disturbed
Candidate cell information after elimination.
（Note 8）Cell search apparatus according to note 7, wherein, described device also includes：
Second judging unit, judges whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, the auxiliary synchronous interference is eliminated after unit eliminated using interference
Candidate cell information carry out interference elimination again, the second auxiliary synchronous detection unit carries out again auxiliary synchronous signals detection,
Candidate cell information after to obtain interference elimination again.
（Note 9）Cell search apparatus according to note 7, wherein, the auxiliary synchronous interference eliminates unit to be included：
Second community select unit, according to the metric of auxiliary synchronous signals detection multiple interfered cell informations are selected；
Second channel estimation unit, according to the metric of the interfered cell information method and ginseng of channel estimation are selected
Number, and channel estimation is carried out to the interfered cell information according to the method and parameter of the channel estimation；
Secondary signal reconfiguration unit, according to the result of channel estimation, to the interfered cell information signal reconstruction is carried out；
Second interference cancellation unit, from the reception signal signal related to the interfered cell information is eliminated, and is come
Obtain the signal after interference is eliminated.
（Note 10）A kind of small region search method, the small region search method includes：
The docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing；
Using the master sync signal detect result select interfered cell information, and from it is described reception signal in eliminate with
The related signal of the interfered cell information disturbs the reception signal after eliminating to obtain；
Reception signal after eliminating to the interference carries out master sync signal detection, to obtain the main synchronization after interference is eliminated
Signal identification and timing.
（Note 11）Small region search method according to note 10, wherein, methods described also includes：
Master sync signal mark and timing after being eliminated according to master sync signal mark and timing and the interference,
Carry out auxiliary synchronous signals detection.
（Note 12）Small region search method according to note 10, wherein, methods described also includes：
Judge whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, using interference eliminate after master sync signal done again
Elimination is disturbed, and carries out master sync signal detection again, to obtain master sync signal mark and timing after eliminating are disturbed again.
（Note 13）Small region search method according to note 10, wherein, the knot detected using the master sync signal
Fruit selects interfered cell information, and eliminates the signal related to the interfered cell information to obtain from the reception signal
Reception signal after interference elimination, specifically includes：
Multiple interfered cell informations are selected according to the correlation of master sync signal detection；
The method and parameter of channel estimation are selected according to the correlation of the interfered cell information, and is estimated according to the channel
The method and parameter of meter carries out channel estimation to the interfered cell information；
Signal reconstruction is carried out to the interfered cell information according to the result of channel estimation；
Eliminate the signal related to the interfered cell information to obtain connecing after interference is eliminated from the reception signal
The collection of letters number.
（Note 14）Small region search method according to note 13, wherein, the method for the channel estimation is believed including LS
Channel estimation method, MMSE method, DTF-Based methods or LS add averaging method；The parameter of the channel estimation includes smooth length
Degree, ZF add the linear smoothing parameter of linear averaging parameter or frequency.
（Note 15）Small region search method according to note 10, wherein, methods described also includes：
It is determined that carrying out search window when master sync signal is detected；Wherein second master sync signal detects used inspection
Survey window and detect used detection window less than the first master sync signal.
（Note 16）Small region search method according to note 11, wherein, identified according to the master sync signal and fixed
When and the interference eliminate after master sync signal mark and timing carry out auxiliary synchronous signals detection, specifically include：
Auxiliary synchronous signals detection is carried out according to master sync signal mark and timing, to obtain candidate cell information；
Interfered cell information is selected using the candidate cell information, and is eliminated and the interfered cell in signal from receiving
The related signal of information disturbs the signal after eliminating to obtain；
Signal after eliminating to the interference carries out auxiliary synchronous signals detection, obtains the candidate cell letter after interference is eliminated
Breath.
（Note 17）Small region search method according to note 16, wherein, methods described also includes：
Judge whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, using interference eliminate after candidate cell information carry out again
Interference is eliminated, and carries out auxiliary synchronous signals detection again, and to obtain the candidate cell information after eliminating is disturbed again.
（Note 18）Small region search method according to note 16, wherein, select dry using the candidate cell information
Cell information is disturbed, and after eliminating the signal related to the interfered cell information from reception signal to obtain interference elimination
Signal, specifically includes：
Multiple interfered cell informations are selected according to the metric of auxiliary synchronous signals detection；
The method and parameter of channel estimation are selected according to the metric of the interfered cell information, and is estimated according to the channel
The method and parameter of meter carries out channel estimation to the interfered cell information；
According to the result of channel estimation, signal reconstruction is carried out to the interfered cell information；
Eliminate the signal related to the interfered cell information to obtain the letter after interference is eliminated from the reception signal
Number.
（Note 19）A kind of user equipment, the user equipment includes the cell searching dress as described in being attached 1 to 9 any one
Put.
（Note 20）A kind of computer-readable program, wherein when described program is performed in a user device, described program
So that computer performs the small region search method as any one of note 10 to note 18 in the user equipment.
（Note 21）A kind of storage medium of the computer-readable program that is stored with, wherein the computer-readable program is caused
Computer performs in a user device the small region search method as any one of note 10 to 18.
Claims (9)
1. a kind of cell search apparatus, the cell search apparatus include：
First main synchronous detection unit, the docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and determine
When；
Main synchronous interference eliminates unit, and the result detected using the master sync signal selects interfered cell information, and from described
Receive and eliminate the signal related to the interfered cell information in signal to obtain the reception signal after interference is eliminated；
Second main synchronous detection unit, the reception signal after eliminating to the interference carries out master sync signal detection, dry to obtain
Disturb master sync signal mark and timing after eliminating；
Auxiliary synchronous detection unit, the master sync signal after being eliminated according to master sync signal mark and timing and the interference
Mark and timing, carry out auxiliary synchronous signals detection.
2. cell search apparatus according to claim 1, wherein, described device also includes：
First judging unit, judges whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, the interference cancellation unit eliminated using interference after main synchronous letter
Number interference elimination is carried out again, and the second main synchronous detection unit carries out again master sync signal detection, to obtain again
Master sync signal after secondary interference is eliminated is identified and timing.
3. cell search apparatus according to claim 1, wherein, the main synchronous interference eliminates unit to be included：
First community select unit, according to the correlation of master sync signal detection multiple interfered cell informations are selected；
First channel estimating unit, according to the correlation of the interfered cell information method and parameter of channel estimation are selected, and
Channel estimation is carried out to the interfered cell information according to the method and parameter of the channel estimation；
First signal reconstruction unit, signal reconstruction is carried out according to the result of channel estimation to the interfered cell information；
First interference cancellation unit, eliminates the signal related to the interfered cell information to obtain from the reception signal
Reception signal after interference elimination.
4. cell search apparatus according to claim 1, wherein, described device also includes：
Window determining unit, determines that the described first main synchronous detection unit and the second main synchronous detection unit are carrying out leading together
Search window during step signal detection；The detection window that wherein described second main synchronous detection unit is used is less than described first
The detection window that main synchronous detection unit is used.
5. cell search apparatus according to claim 1, wherein, the auxiliary synchronous detection unit includes：
First auxiliary synchronous detection unit, carries out auxiliary synchronous signals detection, to obtain candidate according to master sync signal mark and timing
Cell information；
Auxiliary synchronous interference eliminates unit, and using the candidate cell information interfered cell information is selected, and disappears in signal from receiving
The signal after interference is eliminated is obtained except the signal related to the interfered cell information；
Second auxiliary synchronous detection unit, the signal after eliminating to the interference carries out auxiliary synchronous signals detection, obtains interference and eliminates
Candidate cell information afterwards.
6. cell search apparatus according to claim 5, wherein, described device also includes：
Second judging unit, judges whether to reach pre-conditioned；
Also, be not reaching to it is pre-conditioned in the case of, the auxiliary synchronous interference eliminates the time after unit is eliminated using interference
Cell information is selected to carry out interference elimination again, the second auxiliary synchronous detection unit carries out again auxiliary synchronous signals detection, to obtain
Obtain the candidate cell information after again interference is eliminated.
7. cell search apparatus according to claim 5, wherein, the auxiliary synchronous interference eliminates unit to be included：
Second community select unit, according to the metric of auxiliary synchronous signals detection multiple interfered cell informations are selected；
Second channel estimation unit, according to the metric of the interfered cell information method and parameter of channel estimation are selected, and
Channel estimation is carried out to the interfered cell information according to the method and parameter of the channel estimation；
Secondary signal reconfiguration unit, according to the result of channel estimation, to the interfered cell information signal reconstruction is carried out；
Second interference cancellation unit, eliminates the signal related to the interfered cell information to obtain from the reception signal
Signal after interference elimination.
8. a kind of small region search method, the small region search method includes：
The docking collection of letters number carries out master sync signal detection, to obtain master sync signal mark and timing；
Using the master sync signal detect result select interfered cell information, and from it is described reception signal in eliminate with it is described
The related signal of interfered cell information disturbs the reception signal after eliminating to obtain；
Reception signal after eliminating to the interference carries out master sync signal detection, to obtain the master sync signal after interference is eliminated
Mark and timing；
Master sync signal mark and timing after being eliminated according to master sync signal mark and timing and the interference, is carried out
Auxiliary synchronous signals are detected.
9. a kind of user equipment, the user equipment includes the cell search apparatus as described in any one of claim 1 to 7.
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|---|---|---|---|---|
| CN102223696A (en) * | 2011-06-17 | 2011-10-19 | 电子科技大学 | Cell searching method in LTE (long term evolution) system |
| WO2011137314A1 (en) * | 2010-04-30 | 2011-11-03 | Qualcomm Incorporated | Interference cancellation |
| CN102469475A (en) * | 2010-11-19 | 2012-05-23 | 中兴通讯股份有限公司 | Method and device for interference cancellation in wireless communication system |
| CN102572970A (en) * | 2011-12-21 | 2012-07-11 | 华为技术有限公司 | Method and device for searching cell in homogeneous-frequency neighboring cells |
| CN102724159A (en) * | 2012-06-20 | 2012-10-10 | 华为技术有限公司 | Interference elimination method and device for interfered residential area |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011137314A1 (en) * | 2010-04-30 | 2011-11-03 | Qualcomm Incorporated | Interference cancellation |
| CN102469475A (en) * | 2010-11-19 | 2012-05-23 | 中兴通讯股份有限公司 | Method and device for interference cancellation in wireless communication system |
| CN102223696A (en) * | 2011-06-17 | 2011-10-19 | 电子科技大学 | Cell searching method in LTE (long term evolution) system |
| CN102572970A (en) * | 2011-12-21 | 2012-07-11 | 华为技术有限公司 | Method and device for searching cell in homogeneous-frequency neighboring cells |
| CN102724159A (en) * | 2012-06-20 | 2012-10-10 | 华为技术有限公司 | Interference elimination method and device for interfered residential area |
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