CN102510566A - Method and device for searching neighbor-cell of LTE (long term evolution) system - Google Patents

Method and device for searching neighbor-cell of LTE (long term evolution) system Download PDF

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CN102510566A
CN102510566A CN2011103913431A CN201110391343A CN102510566A CN 102510566 A CN102510566 A CN 102510566A CN 2011103913431 A CN2011103913431 A CN 2011103913431A CN 201110391343 A CN201110391343 A CN 201110391343A CN 102510566 A CN102510566 A CN 102510566A
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peak value
peak
nid1
sss
adjacent area
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CN102510566B (en
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李亚辉
张国松
胡剑锋
莫勇
任江涛
吴齐发
唐相国
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HEFEI DONGXIN COMMUNICATION CO Ltd
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HEFEI DONGXIN COMMUNICATION CO Ltd
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Abstract

The invention discloses a method and a device for searching a neighbor-cell of an LTE (long term evolution) system. The method comprises the following steps of: when SSS (Secondary Synchronization Signal) detection is carried out on a digital signal, comparing the peak value corresponding to the relative power of the digital signal on the frequency domain with the preset threshold, confirming the real peak value corresponding to the relative power according to the compared result; calculating the Nid1 corresponding to the real peak value and the Nid1 corresponding to a fake peak value and carrying out the dropping treatment until the comparison is finished; calculating and obtaining the Nid1 corresponding to the real peak value and marks before and after 5 ms; finally, calculating the ID (identification) Nid2 and 5 ms timing determined through preset PSS(Primary Synchronization Signal) detection, the Nid1, the marks before and after 5ms to obtain the Cell ID of the neighbor cell and the frame timing. According to the invention, by means of carrying out the threshold judgment on the SSS relative power and carrying out the dropping treatment on the determined fake peak value, the probability of generating a fake cell in the process of searching the neighbor cell is reduced and the probability of exactly searching the neighbor cell is improved.

Description

The adjacent area searching method and the device of a kind of LTE system
Technical field
The present invention relates to communication technical field, in particular, relate to the adjacent area searching method and the device of a kind of LTE (Long Term Evolution system, Long Term Evolution) system.
Background technology
Current, communication technical field by the 3G epoch in the transient process in 4G epoch, LTE (Long Term Evolution system, Long Term Evolution) system is thought accurate 4G wireless communication system widely.TD-LTE is the LTE system of TDD (Time Division Duplexing, time division duplex) version.
In the prior art, UE (User Equipment, subscriber equipment) utilizes PSS (Primary Synchronization Signal, main synchronizing symbol and SSS (Secondary Synchronization Signal, auxilliary synchronizing symbol) carries out the adjacent area search.Promptly confirm the Nid1 that adopt the sub-district through PSS and SSS, the frame of Nid2 and sub-district regularly and is confirmed the unique ID in sub-district (IDentity, sub-district number) (ID=Nid1*3+Nid2) through Nid1 and Nid2.
To tdd mode; The time-domain position of PSS and SSS is as shown in Figure 1; PSS is positioned at the 3rd OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) symbol of Slot2 and Slot12, and SSS is positioned at last OFDM symbol of Slot1 and Slot11.On frequency domain, no matter system takies much bandwidth, and PSS and SSS are 6 RB in the middle of only taking.
Wherein, PSS symbols carry PSC sign indicating number (Primary Synchronization Code, Primary Synchronisation Code); This PSC sign indicating number is the Zadoff-Chu sequence that is defined on the frequency domain; Can distinguish different Nid2 based on this Zadoff-Chu sequence with three different root sequences (25,29,34).SSS symbols carry SSC sign indicating number (Secondary Synchronization Code; Secondary synchronization code); This SSC sign indicating number is interweaved by the binary sequence of 2 31 length and is in series; Co-exist in 336 kinds of possible sequential structures, utilizing this SSC sign indicating number can distinguish two kinds of 5ms sign behind 5ms sign before 168 kinds of Nid1 and the sub-district or the sub-district maybe.
According to agreement 36.211, the definition of SSC sequence d (n) is shown in formula (1) and formula (2):
Figure BDA0000114598590000011
Figure BDA0000114598590000021
Wherein, Nid1 and m 0, m 1Corresponding relation shown in figure 12.
Utilizing prior art to carry out in the process of adjacent area search, generally detecting for two steps and form by PSS detection and SSS.Detect Nid2 and the timing of 5ms frame that obtains the adjacent area through PSS, detect Nid1 and the front and back 5ms sign that obtains the adjacent area through SSS.As shown in Figure 2, in the TD-LTE system, all eNodeB (base station) are synchronous, if a UE is identical with the distance of two eNodeB, carries out PSS so and detect, and the 5ms frame that gets access to these two sub-districts is regularly then identical.If the Nid2 of these two sub-districts is also identical, PSS detects and then can't distinguish this two sub-districts, and for only existing 3 different Nid2 to distribute, then occur can't distinguishing cell probability will be very high.Therefore, for addressing the above problem, prior art reports a plurality of peak values usually when carrying out the SSS detection, confirm whether to exist in this case a plurality of sub-districts through threshold judgement.
But, when doing the SSS detection in the prior art, except the auto-correlation peak value, the SSC relevant correlation peak that can go out serve vacation corresponding with other Nid1.Can know by formula (1) and formula (2), be SSS when relevant, use identical m with transmitting sequence with preceding 5ms sign 0Nid1, its even sequence is identical, the false peaks of therefore can being correlated with out.Same, when being SSS and being correlated with, use identical m with transmitting sequence with back 5ms sign 1Nid1, its even sequence also is identical, the false peaks of also can being correlated with out.
Illustrate, when the Nid1=65 that sends, identify with preceding 5ms and to do relevantly, correlated results is as shown in Figure 3, except the auto-correlation peak value when the Nid1=65, has identical m with Nid1=65 0(m 0=6) other Nid1 (6,36,93,120,146) false peaks of can being correlated with out; Make relevantly of back 5ms sign, correlated results is as shown in Figure 4, except the auto-correlation peak value when the Nid1=65, has identical m with Nid1=65 1(m 1=9) other Nid1 (8,37,92,118,143,167) false peaks of also can being correlated with out.
Therefore; When the adjacent area of employing prior art is searched for; When SSS detects false peaks appears easily carrying out wherein, and the adjacent area that to be not institute will detect, the corresponding false sub-district of detected false peaks or the adjacent area of existence, thereby cause quick and precisely realizing search to all adjacent areas.
Summary of the invention
In view of this, the invention provides the adjacent area searching method and the device of a kind of LTE system, carrying out being prone to detect false sub-district when SSS detects, thereby cause the problem that quick and precisely to search for all adjacent areas to overcome in the prior art.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
The adjacent area searching method of a kind of Long Term Evolution LTE system comprises:
The reception signal is also handled, and obtains corresponding digital signal;
Said digital signal is carried out main synchronizing symbol PSS detect, and confirm the Nid2 and the timing of 5ms frame of adjacent area according to the related power of said digital signal on time domain that obtains;
Said digital signal is assisted synchronizing symbol SSS to be detected; Obtain the related power of said digital signal on frequency domain, peak value and preset thresholding that said related power is corresponding compare, and confirm corresponding real peak value according to comparative result; And the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value; And the corresponding related power of ghost peak is carried out the range of decrease handle, until relatively finishing, calculate and obtain corresponding Nid1 of definite real peak value and front and back 5ms sign;
The said PSS of foundation detects the Nid2 and the 5ms timing of the adjacent area of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtains the cell ID Cell ID and the frame timing of adjacent area.
Preferably, said digital signal is assisted synchronizing symbol SSS detect, the detailed process of calculating and obtain corresponding Nid1 of definite real peak value and front and back 5ms sign comprises:
SSS symbol to getting access in the digital signal is done fast Fourier transform, obtains the frequency-region signal of said SSS symbol;
Extract the subcarrier of corresponding said SSS symbol in the said frequency-region signal;
It is relevant to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence;
Calculate the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time;
Whether judge each peak value greater than preset thresholding by big to little, and confirm the Nid1 of adjacent area according to judged result.
Preferably, whether judge each peak value greater than preset thresholding by big to little, and confirm that according to judged result the detailed process of adjacent area Nid1 is:
Choose current untreated peak-peak; When said untreated peak-peak during greater than preset thresholding; Said untreated peak-peak is designated as the real peak value, when relevant with the local sequence of said untreated peak-peak use in comprise identical binary sequence peak value be designated as false peaks;
Calculate and obtain the corresponding Nid1 of said real peak value, and the Nid1 of corresponding said false peaks;
Reduce the amplitude of the corresponding related power of said false peaks, the range value of said reduction be said real peak value the related power amplitude 1/4;
The said real peak value of mark is returned to carry out and is chosen current this step of untreated peak-peak for handling, and choosing next peak value greater than said preset thresholding is current peak-peak;
When said untreated peak value all is not more than preset thresholding, finish relatively, the Nid1 that calculates and obtain the corresponding adjacent area of said real peak value identifies with front and back 5ms.
Preferably, after cell ID Cell ID that obtains the adjacent area and frame timing, also comprise:
Whether there is the said adjacent area Cell ID that gets access in the inquiry Neighboring Cell List,, then upgrades said Neighboring Cell List if do not exist; If exist, then do not upgrade.
Preferably, each said local sequence is by being designated as m respectively 0And m 1The series connection that interweaves of the binary sequence of two 31 length constitute;
When confirming to be correlated with, use the m in the local sequence 0The m that comprises in the local sequence of using with said untreated peak-peak 0Identical peak value is a false peaks;
Perhaps, use m in the local sequence 1The m that comprises in the local sequence of using with said untreated peak-peak 1Identical peak value is a false peaks.
The adjacent area checkout gear of a kind of Long Term Evolution LTE system comprises:
The front-end processing module is used to receive signal and handles, and obtains corresponding digital signal;
Main synchronizing symbol PSS detection module is used for that said digital signal is carried out PSS and detects, and confirms ID Nid2 and the timing of 5ms frame in the cell set of adjacent area according to the related power of said digital signal on time domain that obtains;
Auxilliary synchronizing symbol SSS detection module is used for that said digital signal is carried out SSS and detects, and obtains the related power of said digital signal on frequency domain; Peak value and preset thresholding that said related power is corresponding compare; And confirm corresponding real peak value according to comparative result, and the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value, and the corresponding related power of ghost peak is carried out the range of decrease handle; Until relatively finishing, calculate and obtain the Nid1 and the front and back 5ms sign of the corresponding adjacent area of said real peak value;
The adjacent area search module is used for the said PSS of foundation and detects adjacent area Nid2 and the 5ms timing of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtains the cell ID Cell ID and the frame timing of adjacent area.
Preferably, comprise in the said auxilliary synchronizing symbol SSS detection module:
Fast Fourier transform module is done fast Fourier transform to the SSS that gets access to, and obtains the frequency-region signal of said SSS symbol;
Extract the SSS sub-carrier block, be used for extracting the subcarrier of the corresponding said SSS symbol of said frequency-region signal;
The SSS correlation module, it is relevant to be used to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence;
The related power computing module is used to calculate the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time;
SSS peak value processing module is used for whether judging each peak value greater than preset thresholding by big to little, and confirms the Nid1 of adjacent area according to judged result.
Preferably, comprise in the said SSS peak value processing module:
The threshold judgement module; Be used to choose current untreated peak-peak; When said untreated peak-peak during greater than preset thresholding; Confirm that said untreated peak-peak is the real peak value, confirm when relevant with local sequence that said untreated peak-peak is used in comprise identical binary sequence peak value be false peaks; When said untreated peak-peak is not more than preset thresholding, finish, the Nid1 that obtains the adjacent area identifies with front and back 5ms;
The peak value computing module is used to calculate and obtain the corresponding Nid1 of said real peak value, and the Nid1 of corresponding said false peaks;
The false peaks processing module is used to reduce the amplitude of the corresponding related power of said false peaks, and the value of said reduction is 1/4 of a said real peak value related power amplitude; And the said real peak value of mark is for handle.
Preferably, also comprise:
Upgrade the Neighboring Cell List module, be used for inquiring about Neighboring Cell List and whether have the said adjacent area CellID that gets access to,, then upgrade said Neighboring Cell List if do not exist; If exist, then do not upgrade.
Can know via above-mentioned technical scheme, compared with prior art, the invention discloses the adjacent area searching method and the device of a kind of LTE system.The data signal that in carrying out the adjacent area search, the processing received signal is obtained is carried out SSS and is detected;, this SSS obtains the related power of data signal on frequency domain in detecting; Successively that said related power is corresponding peak value and preset thresholding compare; And confirm the real peak value that related power is corresponding according to comparative result, and the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value, and the corresponding related power of ghost peak is carried out the range of decrease handle; Until relatively finishing, calculate and obtain corresponding adjacent area Nid1 of definite real peak value and front and back 5ms sign; Finally detect the Nid2 that confirms and 5ms and regularly detect the Nid1 that confirms and front and back 5ms and identify and calculate, obtain the Cell ID and the frame timing of adjacent area with SSS by PSS.Through above-mentioned the SSS related power is carried out threshold judgement, and the false peaks of confirming is carried out the range of decrease handle, can be reduced in the probability that occurs false sub-district in the process of searching for the adjacent area, improve the probability of accurate searching neighboring area.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is the time-domain position sketch map of PSS and SSS under the tdd mode in the prior art;
Fig. 2 be in the prior art two eNodeB to the identical sketch map of UE distance;
Fig. 3 makees the related power sketch map of SSS when relevant for 5ms before using during Nid1=65 in the prior art;
Fig. 4 makees the related power sketch map of SSS when relevant for using back 5ms in the prior art during Nid1=65;
Fig. 5 is the method flow diagram of the adjacent area search of the disclosed a kind of LTE of embodiment of the invention system;
Fig. 6 is the disclosed SSS testing process of embodiment of the invention figure;
Fig. 7 is the disclosed SSS related power of an embodiment of the invention sketch map;
Fig. 8 is disclosed through handling for the first time false peaks SSS related power sketch map afterwards for the embodiment of the invention;
Fig. 9 is disclosed through handling for the second time false peaks SSS related power sketch map afterwards for the embodiment of the invention;
Figure 10 is the adjacent area searched devices block diagram of the disclosed a kind of LTE of embodiment of the invention system;
Figure 11 is the block diagram of the disclosed SSS detection module of the embodiment of the invention;
Figure 12 is disclosed Nid1 and m in the embodiment of the invention 0, m 1Corresponding relation.
Embodiment
For quote and know for the purpose of, the hereinafter explanation of the technical term of Shi Yonging, write a Chinese character in simplified form or abridge and be summarized as follows:
LTE:Long Term Evolution system, long evolving system;
PSS:Primary Synchronization Signal, main synchronizing symbol;
SSS:Secondary Synchronization Signal, auxiliary synchronous signals;
ADC:Analog-to-Digital Converter, A/D converter;
LPF:Low Pass Filter, low pass filter;
FFT:Fast Fourier Transformation, fast Fourier transform;
Nid1: cell set ID;
Nid2: ID in the cell set;
Ms: millisecond, chronomere;
Cell ID: cell ID or Cell Identity CI.
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Can know that by background technology the false peaks of in the process that the SSS that carries out adjacent area search detects, can being correlated with out, and the false sub-district that corresponding false peaks searches out when carrying out the adjacent area search will influence the search of normal adjacent area causes inaccurate to the adjacent area search.Therefore the embodiment of the invention discloses adjacent area searching method and device in a kind of LTE system; Carrying out the range of decrease through the false peaks that occurs during SSS is detected handles; Avoid searching the corresponding false sub-district of false peaks; Thereby realize being reduced in the probability that occurs false sub-district in the process of searching for the adjacent area, and the purpose that improves the probability of accurate searching neighboring area.Particular content is elaborated through following examples.
Embodiment one
See also accompanying drawing 5, the method flow diagram for the present invention discloses the adjacent area search of a kind of LTE system mainly may further comprise the steps:
Step S101, the reception signal is also handled, and obtains corresponding digital signal.
In the process of execution in step S101; Handle at first to the received signal; Obtain required baseband signal, and then the baseband signal that gets access to is carried out sample quantization and analog-to-digital processing, finally obtain output; The corresponding digital signal that receives signal, and utilize this digital signal to carry out following PSS detection and SSS and detect.
Step S102 carries out PSS to said digital signal and detects, and confirms the Nid2 and the 5ms timing of adjacent area according to the related power of said digital signal on time domain that obtains.
In the process of execution in step S102; On time domain; Utilize 3 local sequences of local PSS symbols carry, promptly PSC sequence and the digital signal that receives are slided relevantly, utilize the correlated results that gets access to carry out the calculating of related power; And average the calculating of the relevant power that adds up, and confirm the Nid2 and 5ms timing of adjacent area according to related power according to the related power that calculating gets access to.
Step S103 carries out SSS to said digital signal and detects, and obtains the related power of said digital signal on frequency domain; And the peak value and the preset thresholding of the correspondence of said related power compared; Confirm the Nid1 of corresponding real peak value according to comparative result, and calculate the Nid1 of the corresponding false peaks of the corresponding Nid1 of said real peak value, and the corresponding related power of said false peaks is carried out the range of decrease handle; Until relatively finishing, calculate and obtain the Nid1 and the front and back 5ms sign of the corresponding adjacent area of real peak value.
In the process of execution in step S103; In frequency domain; (this SSC sign indicating number is interweaved by the binary sequence of 2 31 length and is in series to utilize 168 SSC sign indicating numbers of SSS symbols carry; Co-exist in 336 kinds of possible sequential structures), carry out related calculation with the digital signal that receives, and utilize the correlated results that gets access to calculate related power.And utilize the related power that gets access to confirm the Nid1 and the front and back 5ms sign of adjacent area.
By knowing in the background technology, in the process of carrying out correlation computations, except the auto-correlation peak value, the SSC relevant correlation peak that can go out serve vacation corresponding with other Nid1.Therefore; In the process of execution in step S103, the peak value that the related power that gets access to is corresponding compares the Nid1 that confirms corresponding real peak value with preset thresholding, and calculates the Nid1 of the corresponding false peaks of the corresponding Nid1 of said real peak value; And the corresponding related power of said false peaks is carried out the range of decrease handle, so that reduce the influence that it detects other adjacent areas, finally confirm the Nid1 of the adjacent area that the real peak value is corresponding.
Need to prove; The process that compares in this step is a cyclic process, obtains said digital signal behind the related power on the frequency domain, chooses related power corresponding peak-peak and preset thresholding and compares; Be met the corresponding Nid1 of current peak-peak of threshold condition; Promptly obtain this peak-peak being designated as the real peak value, and calculate the Nid1 that confirms the corresponding false peaks of the corresponding Nid1 of this real peak value greater than the corresponding Nid1 of the peak-peak of preset thresholding; And these false peaks of confirming are done the range of decrease handle, promptly reduce the amplitude of its corresponding related power.Get into circulation then; Compare once more; Choose the corresponding untreated peak value of related power and compare with preset thresholding once more, be met the corresponding Nid1 of second largest peak value of threshold condition, this peak value is designated as the real peak value; Calculate the Nid1 of the corresponding ghost peak of this Nid1, and these ghost peaks are done the range of decrease handle.And the like, till not having to satisfy the peak value of preset thresholding.Calculate and obtain corresponding adjacent area Nid1 of these definite real peak values and front and back 5ms sign at last.
In addition, this preset thresholding can be set according to concrete scene, may be selected to be 10 under the more excellent situation, that is to say that preset related power threshold value is 10, and shown in Fig. 3 and Fig. 4, the preset thresholding 10 of this setting promptly corresponds to the peak value of related power.
Step S104, the said PSS of foundation detect adjacent area Nid2 and the 5ms timing of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtain the cell ID Cell ID and the frame timing of adjacent area.
In the process of execution in step S104, the adjacent area Nid2 that utilizes PSS detect to confirm according to formula (3), and SSS detects the corresponding adjacent area Nid1 of real peak value that confirms, can confirm the sub-district Cell ID of the current adjacent area of searching for.While detects definite 5ms timing according to PSS and SSS detects the frame timing that definite front and back 5ms sign can be confirmed the current adjacent area of searching for.
ID＝Nid1*3+Nid2 (3)
Wherein, Nid1 detects via SSS and confirms; Nid2 detects via PSS and confirms; ID is the sub-district Cell ID of the current adjacent area of searching for.
The false peaks that in the process that SSS detects, occurs when relevant is by the way carried out range of decrease operation; Its corresponding related power is positioned under the preset thresholding; So that reduce the probability that searches the corresponding false sub-district of false peaks; Further be reduced in the probability that occurs false sub-district in the process of searching for the adjacent area, realize the purpose of the probability of the accurate searching neighboring area of raising.
Embodiment two
On the basis of the disclosed embodiment of the invention described above, disclosed this embodiment of the present invention detects the above-mentioned SSS that carries out, and calculates and obtain the corresponding adjacent area Nid1 of definite real peak value and be elaborated with the process that front and back 5ms identifies.
As shown in Figure 6, mainly may further comprise the steps:
Step S201 is FFT to the SSS symbol that gets access in the digital signal, obtains the frequency-region signal of said SSS symbol.
Step S202 extracts the subcarrier of corresponding said SSS symbol in the said frequency-region signal.
In the process of execution in step S201 and step S202; On frequency domain, the SSS symbol in the digital signal that receives is done the FFT conversion; To obtain the corresponding frequency-region signal of this SSS symbol; And then from the frequency-region signal that gets access to, extract the corresponding subcarrier SSS_Sc (i) of SSS symbol (i=0 ..., 61).Wherein the value of i is relevant with the binary sequence length of the SSC sign indicating number of SSS symbols carry.
Step S203, it is relevant to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence.
Among the execution in step S203, utilize 168 SSS symbols local sequence Local_SSS (m, i) (m=0 ..., 167, i=0 ..., 61) the SSS subcarrier that extracts with step S202 respectively carries out related calculation according to formula (4), obtains 168 correlated results.
SSS _ Corr _ Result ( m ) = Σ i = 0 61 Local _ SSS * ( m , i ) * SSS _ Sc ( i )
Wherein, m=0 ..., 167, the value of m is relevant with the local sequence number of SSS symbol; I=0 ..., 61 is relevant with the binary sequence that constitutes local sequence.
Step S204 calculates the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time.
In the process of execution in step S204, utilize formula (5) that 168 correlated results that get access among the step S203 are carried out the calculating of related power.
SSS_Corr_Power(m)＝||SSS_Corr_Result(m)|| 2 (5)
Whether step S205 judges each peak value greater than preset thresholding by big to little, and confirms adjacent area cell set ID Nid1 according to judged result.
In the process of execution in step S205, as shown in Figure 6, mainly may further comprise the steps:
Step S2051 chooses current untreated peak-peak, whether judges said untreated peak-peak greater than preset thresholding, if, execution in step S2052 then; If deny, then execution in step S2056.
Step S2052 confirms that said untreated peak-peak is the real peak value, confirm when relevant with local sequence that said untreated peak-peak is used in comprise identical binary sequence peak value be false peaks.
In the process of execution in step S2052, referring to Nid1 in the accompanying drawing 12 and m 0, m 1Mapping table, be specially and confirming to use the m in the local sequence when relevant 0The m that comprises in the local sequence of using with said untreated peak-peak 0Identical peak value is a false peaks.
Perhaps, use m in the local sequence 1The m that comprises in the local sequence of using with said untreated peak-peak 1Identical peak value is a false peaks.
Step S2053 calculates and obtains the corresponding Nid1 of said real peak value, and the corresponding Nid1 of corresponding said false peaks.
Step S2054 reduces the amplitude of the corresponding related power of said false peaks, and the value of said reduction is 1/4 of a said real peak value related power amplitude.
Step S2055, the said real peak value of mark is returned execution in step S2051 for handling.
Step S2056 calculates and obtains the Nid1 and the front and back 5ms sign of the corresponding adjacent area of said real peak value according to the Nid1 of the said real peak value of confirming.
Carry out the process that SSS detects for clearer description is above-mentioned, be illustrated with concrete data here.
If (Nid1=40 is Nid2=1) with 196 (Nid1=65, Nid2=1), these two sub-districts are identical to the timing of UE, power difference 6dB to have around the UE two sub-districts, Cell Id to be respectively 121.
As shown in Figure 7, for SSS with the relevant related power of preceding 5ms.Can be found out that by Fig. 7 the peak power that Nid1=40 is corresponding is maximum, the peak power that Nid1=65 is corresponding is lower than the false peaks that Nid1=40 introduces.If when adopting this moment the mode of prior art to carry out the judgement of true and false peak value, will be difficult to detect this sub-district of Nid1=65, or can detect false sub-district.
Therefore adopt the disclosed step S2051 of the invention described above～step S2056 to search and false peaks is handled.
Execution in step S2051 judges that at first whether peak-peak is greater than threshold condition in the peak value that is untreated.In this embodiment, getting preset thresholding is 10, but is not limited in this.Can know that by Fig. 7 peak-peak is the corresponding peak value of Nid1=40 in the peak value that is untreated, and satisfies greater than preset this Rule of judgment of thresholding.
Secondly, execution in step S2052 is through looking into Nid1 shown in the accompanying drawing 12 and m 0, m 1Mapping table, the Nid1 that can know this untreated peak-peak is 40, corresponding its Nid1 of false peaks is (10,69,97,124,150).
At execution in step S2053, calculate the corresponding Nid1 of this peak value and the Nid1 of corresponding ghost peak.
After confirming false peaks, each false peaks is handled according to formula (6),
SSS_Corr_Power(f)＝SSS_Corr_Power(f)-SSS_Corr_Power(r)/4 (6)
Need to prove, if SSS_Corr_Power (f) less than 0, puts 0 to SSS_Corr_Power (f).
Wherein, f is the corresponding Nid1 of false peaks, and r is the corresponding Nid1 of this peak value.
At execution in step S2055, the pairing peak value of Nid1=40 is labeled as handles.And then carry out the processing of next untreated peak-peak.
As shown in Figure 8, handle SSS related power afterwards for above-mentioned false peaks, can know that by figure the false peaks that Nid1=40 introduced has been removed, the peak value that Nid1=65 is corresponding has become second largest peak value.And then carry out above-mentioned steps S2051～step S2055 through iteration again.
When carrying out for the second time iteration, peak-peak is the corresponding peak value of Nid1=65 in the peak value that is untreated that finds, and it also satisfies greater than preset this condition of thresholding, and the Nid1 that can know its corresponding false peaks through tabling look-up is (6,36,93,120,146).And then utilizing formula (6) to carry out the processing of false peaks, the SSS related power after it is handled is as shown in Figure 9, on scheming, can find out that the false peaks that Nid1=65 introduced is removed.Carrying out next iteration successively.
In disclosed embodiment of this invention, through after above-mentioned 2 iteration, there has not been to satisfy peak value in the peak value that is untreated greater than preset this condition of thresholding, iteration finishes.Promptly iterate to until the Nid1 that finds all adjacent areas, and remove corresponding false peaks, last execution in step S2056 calculates and obtains corresponding adjacent area Nid1 of definite real peak value and front and back 5ms sign.
Confirm the Nid1 and the front and back 5ms sign of adjacent area in conjunction with said process, and openly carry out Nid2 and 5ms timing that PSS detects the adjacent area that gets access in the foregoing description one, obtain the cell ID Cell ID and the frame timing of adjacent area according to formula (3).
Disclosed embodiment of this invention; The false peaks that in the process that SSS detects, occurs when relevant is by the way carried out range of decrease operation; Its corresponding related power is positioned under the preset thresholding; So that reduce the probability that searches the corresponding false sub-district of false peaks, further be reduced in the probability that occurs false sub-district in the process of searching for the adjacent area, realization improves the purpose of the probability of accurate searching neighboring area.
Embodiment three
On the basis of the invention described above embodiment one and embodiment two disclosed methods, after cell ID Cell ID that gets access to the adjacent area and frame timing, also comprise:
Whether there is the said adjacent area Cell ID that gets access in the inquiry Neighboring Cell List,, then upgrades said Neighboring Cell List if do not exist; If exist, then do not upgrade.
In carrying out said process, carrying out PSS, to detect the process that detects with SSS identical with process among the foregoing description one and the embodiment two, so no longer give unnecessary details here, but cross-references.
Describe the method that the adjacent area of a kind of LTE system is detected among the disclosed embodiment of the invention described above in detail; Can adopt the device of various ways to realize for method of the present invention; Therefore the invention also discloses the adjacent area checkout gear of a kind of LTE system, provide concrete embodiment below and be elaborated.
Shown in figure 10, the device for the adjacent area of the disclosed a kind of LTE of embodiment of the invention system is detected mainly comprises: front-end processing module 101, PSS detection module 102, SSS detection module 103, adjacent area search module 104 and upgrade Neighboring Cell List module 105.
Front-end processing module 101 is used to receive signal and handles, and obtains corresponding digital signal.
PSS detection module 102 is used for that said digital signal is carried out PSS and detects, and confirms the Nid2 and the 5ms timing of adjacent area according to the related power of said digital signal on time domain that obtains.
SSS detection module 103 is used for that said digital signal is carried out SSS and detects, and obtains the related power of said digital signal on frequency domain; Peak value and preset thresholding that said related power is corresponding compare; And confirm corresponding real peak value according to comparative result, and the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value, and the corresponding related power of ghost peak is carried out the range of decrease handle; Until relatively finishing, calculate and obtain corresponding adjacent area Nid1 of definite real peak value and front and back 5ms sign.
Adjacent area search module 104 is used for the said PSS of foundation and detects adjacent area Nid2 and the 5ms timing of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtains the cell ID Cell ID and the frame timing of adjacent area.
Upgrade Neighboring Cell List module 105, be used for inquiring about Neighboring Cell List and whether have the said adjacent area Cell ID that gets access to,, then upgrade said Neighboring Cell List if do not exist; If exist, then do not upgrade.
Because process is identical in the implementation of above-mentioned each module and the invention described above the disclosed embodiments, give unnecessary details no longer more here, can correspondence carry out reference.
Above-mentioned disclosed SSS detection module 103, shown in figure 11, it mainly comprises: FFT module 201, extraction SSS sub-carrier block 202, SSS correlation module 203, related power computing module 204 and SSS peak value processing module 205.
FFT module 201 is done fast Fourier transform to the SSS that gets access to, and obtains the frequency-region signal of said SSS symbol.
Extract SSS sub-carrier block 202, be used for extracting the subcarrier of the corresponding said SSS symbol of said frequency-region signal.
SSS correlation module 203, it is relevant to be used to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence.
Related power computing module 204 is used to calculate the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time.
SSS peak value processing module 205 is used for whether judging each peak value greater than preset thresholding by big to little, and confirms the Nid1 of adjacent area according to judged result.
Then mainly comprise in this SSS peak value processing module 205: threshold judgement module 2051, peak value computing module 2052 and false peaks processing module 2053.
Threshold judgement module 2051; Be used to choose current untreated peak-peak; When said untreated peak-peak during greater than preset thresholding; Confirm that said untreated peak-peak is the real peak value, confirm when relevant with local sequence that said untreated peak-peak is used in comprise identical binary sequence peak value be false peaks; When said untreated peak-peak is not more than preset thresholding, finish, the Nid1 that obtains the adjacent area identifies with front and back 5ms.
Peak value computing module 2052 is used to calculate and obtain the corresponding Nid1 of said real peak value, and the Nid1 of corresponding said false peaks.
False peaks processing module 2053 is used to reduce the amplitude of the corresponding related power of said false peaks, and the value of said reduction is 1/4 of a said real peak value related power amplitude; And the said real peak value of mark is for handle.
Equally, therefore the concrete implementation of above-mentioned each module can, no longer give unnecessary details referring to the counterpart in the foregoing description two here.
In sum:
Through the invention described above the disclosed embodiments; In the process that SSS detects, false peaks occurs when relevant and carry out range of decrease operation; Its corresponding related power is positioned under the preset thresholding; So that reduce the probability that searches the corresponding false sub-district of false peaks, further be reduced in the probability that occurs false sub-district in the process of searching for the adjacent area, realization improves the purpose of the probability of accurate searching neighboring area.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.

Claims (9)

1. the adjacent area searching method of a Long Term Evolution LTE system is characterized in that, comprising:
The reception signal is also handled, and obtains corresponding digital signal;
Said digital signal is carried out main synchronizing symbol PSS detect, and confirm the Nid2 and the timing of 5ms frame of adjacent area according to the related power of said digital signal on time domain that obtains;
Said digital signal is assisted synchronizing symbol SSS to be detected; Obtain the related power of said digital signal on frequency domain, peak value and preset thresholding that said related power is corresponding compare, and confirm corresponding real peak value according to comparative result; And the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value; And the corresponding related power of ghost peak is carried out the range of decrease handle, until relatively finishing, calculate and obtain corresponding Nid1 of definite real peak value and front and back 5ms sign;
The said PSS of foundation detects the Nid2 and the 5ms timing of the adjacent area of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtains the cell ID Cell ID and the frame timing of adjacent area.
2. method according to claim 1 is characterized in that, said digital signal is assisted synchronizing symbol SSS detect, and the detailed process of calculating and obtain corresponding Nid1 of definite real peak value and front and back 5ms sign comprises:
SSS symbol to getting access in the digital signal is done fast Fourier transform, obtains the frequency-region signal of said SSS symbol;
Extract the subcarrier of corresponding said SSS symbol in the said frequency-region signal;
It is relevant to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence;
Calculate the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time;
Whether judge each peak value greater than preset thresholding by big to little, and confirm the Nid1 of adjacent area according to judged result.
3. method according to claim 2 is characterized in that, whether judges each peak value greater than preset thresholding by big to little, and confirms that according to judged result the detailed process of adjacent area Nid1 is:
Choose current untreated peak-peak; When said untreated peak-peak during greater than preset thresholding; Said untreated peak-peak is designated as the real peak value, when relevant with the local sequence of said untreated peak-peak use in comprise identical binary sequence peak value be designated as false peaks;
Calculate and obtain the corresponding Nid1 of said real peak value, and the Nid1 of corresponding said false peaks;
Reduce the amplitude of the corresponding related power of said false peaks, the range value of said reduction be said real peak value the related power amplitude 1/4;
The said real peak value of mark is returned to carry out and is chosen current this step of untreated peak-peak for handling, and choosing next peak value greater than said preset thresholding is current peak-peak;
When said untreated peak value all is not more than preset thresholding, finish relatively, the Nid1 that calculates and obtain the corresponding adjacent area of said real peak value identifies with front and back 5ms.
4. according to any described method in the claim 1～3, it is characterized in that, after cell ID Cell ID that obtains the adjacent area and frame timing, also comprise:
Whether there is the said adjacent area Cell ID that gets access in the inquiry Neighboring Cell List,, then upgrades said Neighboring Cell List if do not exist; If exist, then do not upgrade.
5. according to the method described in claim 2 or 3, it is characterized in that each said local sequence is by being designated as m respectively 0And m 1The series connection that interweaves of the binary sequence of two 31 length constitute;
When confirming to be correlated with, use the m in the local sequence 0The m that comprises in the local sequence of using with said untreated peak-peak 0Identical peak value is a false peaks;
Perhaps, use m in the local sequence 1The m that comprises in the local sequence of using with said untreated peak-peak 1Identical peak value is a false peaks.
6. the adjacent area checkout gear of a Long Term Evolution LTE system is characterized in that, comprising:
The front-end processing module is used to receive signal and handles, and obtains corresponding digital signal;
Main synchronizing symbol PSS detection module is used for that said digital signal is carried out PSS and detects, and confirms ID Nid2 and the timing of 5ms frame in the cell set of adjacent area according to the related power of said digital signal on time domain that obtains;
Auxilliary synchronizing symbol SSS detection module is used for that said digital signal is carried out SSS and detects, and obtains the related power of said digital signal on frequency domain; Peak value and preset thresholding that said related power is corresponding compare; And confirm corresponding real peak value according to comparative result, and the Nid1 that calculates the corresponding false peaks of the corresponding Nid1 of real peak value, and the corresponding related power of ghost peak is carried out the range of decrease handle; Until relatively finishing, calculate and obtain the Nid1 and the front and back 5ms sign of the corresponding adjacent area of said real peak value;
The adjacent area search module is used for the said PSS of foundation and detects adjacent area Nid2 and the 5ms timing of confirming, and said SSS detects the corresponding adjacent area Nid1 of definite real peak value and 5ms sign in front and back is calculated, and obtains the cell ID Cell ID and the frame timing of adjacent area.
7. device according to claim 6 is characterized in that, comprises in the said auxilliary synchronizing symbol SSS detection module:
Fast Fourier transform module is done fast Fourier transform to the SSS that gets access to, and obtains the frequency-region signal of said SSS symbol;
Extract the SSS sub-carrier block, be used for extracting the subcarrier of the corresponding said SSS symbol of said frequency-region signal;
The SSS correlation module, it is relevant to be used to utilize each local sequence of said SSS symbol respectively said subcarrier to be done, and obtains the correlated results of corresponding each said local sequence;
The related power computing module is used to calculate the corresponding related power of each said correlated results, by big peak value to the related power correspondence of choosing preset number for a short time;
SSS peak value processing module is used for whether judging each peak value greater than preset thresholding by big to little, and confirms the Nid1 of adjacent area according to judged result.
8. device according to claim 7 is characterized in that, comprises in the said SSS peak value processing module:
The threshold judgement module; Be used to choose current untreated peak-peak; When said untreated peak-peak during greater than preset thresholding; Confirm that said untreated peak-peak is the real peak value, confirm when relevant with local sequence that said untreated peak-peak is used in comprise identical binary sequence peak value be false peaks; When said untreated peak-peak is not more than preset thresholding, finish, the Nid1 that obtains the adjacent area identifies with front and back 5ms;
The peak value computing module is used to calculate and obtain the corresponding Nid1 of said real peak value, and the Nid1 of corresponding said false peaks;
The false peaks processing module is used to reduce the amplitude of the corresponding related power of said false peaks, and the value of said reduction is 1/4 of a said real peak value related power amplitude; And the said real peak value of mark is for handle.
9. according to any described device in the claim 6～8, it is characterized in that, also comprise:
Upgrade the Neighboring Cell List module, be used for inquiring about Neighboring Cell List and whether have the said adjacent area CellID that gets access to,, then upgrade said Neighboring Cell List if do not exist; If exist, then do not upgrade.
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