CN102356671A - Method and device of communication system frequency search - Google Patents
Method and device of communication system frequency search Download PDFInfo
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- CN102356671A CN102356671A CN2011800017882A CN201180001788A CN102356671A CN 102356671 A CN102356671 A CN 102356671A CN 2011800017882 A CN2011800017882 A CN 2011800017882A CN 201180001788 A CN201180001788 A CN 201180001788A CN 102356671 A CN102356671 A CN 102356671A
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Abstract
The invention discloses a method and a device of communication system frequency search, and relates to the field of the communication system. The method and the device of communication system frequency search reduces time of communication system frequency search. The method of communication system frequency search comprises that: through normalizing process of temporal sequence of a master sync signal PSS and a temporal signal of a carrier frequency point, a normalized cross-correlation value of a signal of a carrier frequency point is obtained; the normalized cross-correlation value of a signal of a carrier frequency point is detected and is compared with a preset normalized cross-correlation threshold value; and when the normalized cross-correlation value of a signal of a carrier frequency point is bigger than the normalized cross-correlation threshold value, initial search on the carrier frequency point is carried out. The embodiment of the invention is used for frequency search of a communication system.
Description
Technical field
The present invention relates to field of wireless communications, relate in particular to communication system frequency band search technical field.
Background technology
Subscriber equipment (UE is also referred to as the terminal) is under the situation of known frequency range configuration, and there is the sub-district of LTE system in which frequency that needs to detect in the frequency range, and utilizes initial ranging that Cell searching is arrived, so that attempt resident to said sub-district.The LTE system utilizes PSS (Primary Synchronization Signal, master sync signal) and SSS (Secondary Synchronization Signal, auxiliary synchronous signals) to accomplish Cell searching, and PSS is used for accomplishing timing synchronization.The PSS signal repetition period is 5ms, and the general broad of the configurable frequency range of 3GPP LTE system is 100MHZ like the wideest frequency range.If directly to the search successively one by one of the frequency in any frequency range, then UE will face long problem consuming time to UE, the power consumption quantitative change of UE is big, and user's impression is also very poor.
In order to address this problem, prior art has been attempted the method for frequency power measurement respectively and has been shortened the time that there is the LTE system cell in the UE search based on the frequency band searching method of fast Fourier transform (FFT) spectrum analysis.
Frequency power measurement method is that the watt level of the signal of all frequencies in the frequency range is measured, and confirms the order of frequency point searching through the watt level that records.Yet except that the LTE system, can also allow the existence of other communication systems, in the frequency range like GSM, WCDMA etc.Because the signal transmission power of different system tends to the system greater than LTE, the carrier frequency point of different system can come true frequency front, has the problem of frequency band search overlong time equally like this.
Frequency band search based on the FFT spectrum analysis is that the power spectral density (PSD) of utilizing different system is carried out system identification.Yet because there is multiple transmitted bandwidth in the LTE system, so PSD identification need be attempted relevant all possible transmitted bandwidth to each frequency, will cause the amount of calculation of system and complexity to strengthen like this, still exists the problem of systematic search overlong time.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus of communication system frequency band search, can reduce the Cell searching time of UE.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method of communication system frequency band search comprises:
The normalization that the time domain sequences through master sync signal PSS and the time-domain signal of carrier frequency point carry out is handled, and obtains the signal normalization cross correlation value of said carrier frequency point;
Whether the signal normalization cross correlation value that detects said carrier frequency point is greater than preset normalized crosscorrelation threshold value;
When the signal normalization cross correlation value of said carrier frequency point during, said carrier frequency point is carried out initial ranging greater than said normalized crosscorrelation threshold value.
A kind of device of communication system frequency band search comprises:
Normalized crosscorrelation value acquiring unit is used for the normalization that the time-domain signal of time domain sequences and carrier frequency point through PSS carries out and handles, and obtains the signal normalization cross correlation value of said carrier frequency point;
Detecting unit, whether the signal normalization cross correlation value that is used to detect said carrier frequency point is greater than preset normalized crosscorrelation threshold value;
The initial ranging unit is used for when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value said carrier frequency point being carried out initial ranging.
The method and apparatus of the communication system frequency band search that the embodiment of the invention provides, the normalization that the time domain sequences through PSS and the time-domain signal of carrier frequency point carry out is handled, and obtains the signal normalization cross correlation value of said carrier frequency point; When the signal normalization cross correlation value of said carrier frequency point during, said carrier frequency point is carried out initial ranging greater than said normalized crosscorrelation threshold value.For the signal of non-this communication system, can compare like this, directly get rid of these frequencies, need not carry out initial ranging, thereby shorten initial cell search time and the number of times of UE it through the size of normalized crosscorrelation value.
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 some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the method for the communication system frequency band search that Fig. 1 provides for the embodiment of the invention one;
The block diagram of the device of the LTE system frequency band search that Fig. 2 provides for the embodiment of the invention one;
The method flow sketch map of the LTE system frequency band search that Fig. 3 provides for the embodiment of the invention two;
The schematic flow sheet of the method for the LTE system frequency band search that Fig. 4 provides for the embodiment of the invention three;
The block diagram of the device of the LTE system frequency band search that Fig. 5 provides for the embodiment of the invention four;
The block diagram of the device of the LTE system frequency band search that Fig. 6 provides for the embodiment of the invention five;
The another kind of block diagram of the device of the LTE system frequency band search that Fig. 7 provides for the embodiment of the invention five.
Embodiment
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.
Embodiment one,
The method of the communication system frequency band search that the embodiment of the invention provides, as shown in Figure 1, may further comprise the steps:
S101, the normalization of carrying out through the time-domain signal to the time domain sequences of master sync signal PSS and carrier frequency point are handled, and obtain the signal normalization cross correlation value of said carrier frequency point.
Whether the signal normalization cross correlation value of S102, the said carrier frequency point of detection is greater than preset normalized crosscorrelation threshold value.
S103, when said signal normalization cross correlation value during greater than said normalized crosscorrelation threshold value, said carrier frequency point is carried out initial ranging.
UE searches resident to suitable cell from start, need carry out initial ranging.With the LTE system is example, and initial cell search need be accomplished detection, OFDM (OFDM) sign synchronization and frame synchronization, Cyclic Prefix (CP) type detection, the big or small processes such as estimation of frequency deviation of sub-district ID, and concrete search procedure repeats no more here.
The embodiment of the invention also provides the device of communication system frequency band search, and is as shown in Figure 2, comprises normalized crosscorrelation value acquiring unit 21, detecting unit 22, initial ranging unit 23.
Normalized crosscorrelation value acquiring unit 21 is used for the normalization that the time-domain signal of time domain sequences and carrier frequency point through PSS carries out and handles, and obtains the signal normalization cross correlation value of said carrier frequency point.
Detecting unit 22, whether the signal normalization cross correlation value that is used to detect said carrier frequency point is greater than preset normalized crosscorrelation threshold value.
Initial ranging unit 23 is used for when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value said carrier frequency point being carried out initial ranging.
Wherein, detecting unit 22 can be positioned among the same processor with initial ranging unit 23, and normalized crosscorrelation value acquiring unit 21 can be another processor.Said device can be arranged in the BBP of a UE or UE.
The method and apparatus of the communication system frequency band search that the embodiment of the invention provides; Carry out the normalization processing through the time domain sequences of PSS and the time-domain signal of carrier frequency point; Obtain the normalized crosscorrelation value of said carrier frequency point; And through the normalized crosscorrelation value of the said carrier frequency point of judgement and the size of the normalized crosscorrelation threshold value of presetting; Screen out the carrier frequency point of non-this communication system, need not carry out initial ranging, thereby shortened the time and the number of times of UE terminal frequency band search the carrier frequency point of this part.
Embodiment two,
The embodiment of the invention provides a kind of method of communication system frequency band search, and present embodiment specifically specifies with the LTE system, and is as shown in Figure 3, may further comprise the steps:
The cross-correlation numerical value X of the time-domain signal of S301, the time domain sequences of calculating PSS and carrier frequency point
i(d) and the magnitude of power Y of the time-domain signal of said carrier frequency point
i(d)
Wherein
r
i(d) be the time-domain signal of i the reception antenna of UE through the baseband filter reception, the sample rate of present embodiment can be set to 1.92Mbps, and the sampling time is 5ms, r like this
i(d) signal has 9600 sampled points, and d is the sampled point numbering of the time-domain signal of said carrier frequency point, and d is the numerical value between 0 to 9599.Certainly the time-domain signal of baseband filter reception can also be taken a sample from a plurality of 5ms and adopted a little, is used to support the more frequency band search of low signal-to-noise ratio.
Wherein
is the time domain sequences of
determined PSS; Time domain sequences is a plural form; In computational process, need carry out conjugation to plural number calculates; Promptly
is for being used for confirming the parameter of cell ID in the LTE system physical layer; Value is { 0; 1; 2}, the time domain sequences of PSS is unique by
to be confirmed.N is the length of the time domain sequences of PSS, wherein N=128, and M*L=N, but the M value is 2,4,8 etc.
S302, confirm that said carrier frequency point signal normalization cross correlation value PSSCorr promptly
Time domain sequences corresponding to each PSS; The correlation that calculates each sampled point obtains
to the signal normalization cross correlation value of the maximum in the correlation
of said each sampled point of the time domain sequences of said each PSS as said carrier frequency point, promptly
Wherein I is the number that UE has reception antenna; D representes r
i(d) signals sampling is counted, and as in a last step, sampling number D is taken as 9600.PSS can be for one or more; When PSS has only one; Then UE can be directed against this PSS, calculate the correlation
of each sampled point will be wherein maximum as the signal normalization cross correlation value of said carrier frequency point.If PSS has a plurality of, then UE can be to the correlation
that each PSS calculates each sampled point each sampling point of each PSS all obtain a correlation
and again the maximum in all these values as the signal normalization cross correlation value of said carrier frequency point.
The LTE system physical layer has 504 sub-district ID identification numbers, is divided into 168 different groups, 3 every group different sub-district ID identification numbers.The value that physical-layer cell ID identification number is expressed as
in
is { 0; 1; 2}, the time domain sequences of PSS is unique by
to be confirmed.Accordingly; The signal of each carrier frequency point; The time domain sequences of corresponding 3 different PSS; Obtain corresponding
value than the time domain sequences of 3 PSS determined
, getting maximum is the signal normalization cross correlation value PSSCorr of said carrier frequency point.In practical application; Those skilled in the art can carry out accommodation to scheme; For example; Also can in all
, get second largest value as PSSCorr; Adjusted like this scheme still can effectively detect with respect to prior art, has shortened the time and the number of times of UE frequency band search.
Whether the signal normalization cross correlation value of S303, the said carrier frequency point of detection is greater than preset normalized crosscorrelation threshold value.When the signal normalization cross correlation value of said carrier frequency point is big, change step S304 over to; When the signal normalization cross correlation value of said carrier frequency point hour, change step S305 over to.
Preset normalization threshold value is in advance according to the formula among step S301, the S302, under the situation of estimating channel signal to noise ratio and certain surplus more than needed, and preset normalization threshold value.
S304, when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value, said carrier frequency point is carried out initial ranging.
Through the formula among step S301, the S302, the signal power normalizing that said normalized crosscorrelation value is said carrier frequency point calculates the degree of correlation that receives signal and PSS.When the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value, represent that then the degree of correlation of signal of signal and LTE system of this carrier frequency point is big, then can begin said carrier frequency point is carried out initial ranging.
S305, when the signal normalization cross correlation value of said carrier frequency point is not more than said normalized crosscorrelation threshold value; Or said carrier frequency point does not search the LTE sub-district; Maybe can not carry out when resident the LTE sub-district that searches; The time-domain signal of another carrier frequency point and the time domain sequences of PSS are carried out the signal normalization cross correlation value that said another frequency was handled and obtained in normalization, and proceed testing process.
For the method for above-mentioned frequency band search, specifically describe as follows:
In the frequency range that UE disposed, it is resident to carry out initial ranging to the LTE sub-district after the UE start.UE receives the signal of a carrier frequency point in the frequency range, through the 1.4MHZ baseband filter, obtains time-domain signal; Calculate the magnitude of power Y of the time-domain signal of carrier frequency point
i(d) and the cross-correlation numerical value X of the time-domain signal of the time domain sequences of said PSS and carrier frequency point
i(d); Corresponding to the time domain sequences of each PSS, calculate the correlation of each sampled point
Correlation to said each sampled point of the time domain sequences of said each PSS
In maximum as the signal normalization cross correlation value of said carrier frequency point, promptly
According to the said carrier frequency point PSSCorr value of calculating, compare with preset normalization threshold value, if the PSSCorr value is big; UE can carry out initial ranging, has the LTE sub-district if search, and UE then attempts in this sub-district resident; If the sub-district can't be resident; UE then need switch to another carrier frequency point of this frequency range, calculates the signal normalization cross correlation value of this carrier frequency point, and continues to attempt search according to the method for present embodiment.
If the PSSCorr value is greater than preset normalization threshold value, and UE does not search the LTE sub-district after said carrier frequency point carries out initial ranging, then UE switches to this frequency range and gets another carrier frequency point, calculates the signal normalization cross correlation value of this carrier frequency point.
If the PSSCorr value is less than or equal to preset normalization threshold value, UE then is directly switch to another carrier frequency point, calculates the signal normalization cross correlation value of this carrier frequency point.
Further; If UE success is resident to the interior LTE sub-district of frequency range; Or UE handles all frequencies in the frequency range, and the signal normalization value of said frequency carrier wave is not more than preset normalization threshold value, or do not search the sub-district of LTE; Or do not have resident success in the LTE sub-district that searches, then the UE frequency band search finishes.
The communication system frequency band searching method that the embodiment of the invention provides; Carry out the normalization processing through the time domain sequences of PSS and the time-domain signal of carrier frequency point; Obtain the normalized crosscorrelation value of said carrier frequency point,, can screen out the carrier frequency point of non-this communication system through the size of the normalized crosscorrelation value of judging said carrier frequency point and the normalized crosscorrelation threshold value of presetting; Need not carry out initial ranging, thereby shorten the time and the number of times of UE frequency band search the carrier frequency point of this part.
Embodiment three,
The embodiment of the invention also provides a kind of method of communication system frequency band search, and present embodiment is that example is explained with the LTE system still, and is as shown in Figure 4, comprising:
The normalization that the time-domain signal of S401, the time domain sequences through PSS and carrier frequency point carries out is handled, and obtains the signal normalization cross correlation value of said carrier frequency point.
S402, the signal normalization cross correlation value of a plurality of carrier frequency points of system's frequency range is sorted according to descending order; Obtain first frequency ordering of said carrier frequency point, and whether the normalized crosscorrelation value that detects said carrier frequency point according to the ordering of first frequency is greater than preset normalized crosscorrelation value.
Whether the signal normalization cross correlation value of S403, the said carrier frequency point of detection is greater than preset normalized crosscorrelation threshold value; When the signal normalization cross correlation value of said carrier frequency point is big, then jump to step S404; Otherwise jump to step S406.
S404, when said signal normalization cross correlation value during greater than said normalized crosscorrelation threshold value, said carrier frequency point is carried out initial ranging, if search the LTE sub-district, then jump to step S405; Otherwise jump to step S406.
S405, if UE searches the LTE sub-district, then attempt residently, if can't be resident, then jump to S406; Otherwise UE searches for end.
S406, according to the order of the ordering of said first frequency among the step S402, switch to next frequency, execution in step S403.
Further, the LTE frequency band searching method of the embodiment of the invention can also be:
The normalization that the time domain sequences through PSS and the time-domain signal of carrier frequency point carry out is handled; Before obtaining the signal normalization cross correlation value of said carrier frequency point; Detect the watt level of said carrier frequency point signal earlier,, obtain second frequency ordering of carrier frequency point according to descending ordering of detecting of power; Whether the normalization correlation of detected carrier frequency is greater than preset normalized crosscorrelation threshold value; Corresponding be not more than preset normalized crosscorrelation threshold value or do not search LTE sub-district or can't be resident to the LTE sub-district that searches at said frequency when said carrier frequency point signal normalization value, the order that then sorts according to said second frequency switches to next frequency; Obtain the signal normalization cross correlation value of next carrier frequency point, and continue to carry out said testing process.Certainly, the watt level and the execution ordering that detect said carrier frequency point signal also can be carried out after obtaining the signal normalization cross correlation value of said carrier frequency point.
The communication system frequency band searching method that the embodiment of the invention provides; Numerical values recited through to the normalized crosscorrelation value of frequency range intercarrier frequency sorts; The normalized crosscorrelation value numerical value that at first detects the most preceding carrier frequency point of ordering is big to be compared with preset normalized crosscorrelation threshold value; If the normalized crosscorrelation value of carrier frequency point is big; Said carrier frequency point is carried out initial ranging, not only can screen out the carrier frequency point of non-this communication system like this through the detection of normalized value, further can shorten the time of UE initial ranging.
Embodiment four,
The embodiment of the invention also provides a kind of device of communication system frequency band search, and present embodiment is an example with the LTE system, shown in figure five, comprising: normalized crosscorrelation value acquiring unit 51, detecting unit 52, initial ranging unit 53.Each unit can be a processor, and each processor can be realized by integrated circuit.Said device can be arranged in the BBP of a UE or UE.
Normalized crosscorrelation value acquiring unit 51 is used for the normalization that the time-domain signal through the time domain sequences of PSS and carrier frequency point carries out to be handled, and obtains the signal normalization cross correlation value of said carrier frequency point.
Normalized crosscorrelation value acquiring unit 51 wherein specifically also comprises:
The normalized crosscorrelation value is confirmed subelement 512; The correlation
that is used to calculate said each sampled point wherein I is the number of the reception antenna that has of said UE, with the signal normalization cross correlation value of the maximum in the correlation
of said each sampled point as said carrier frequency point.
Whether the signal normalization cross correlation value that detecting unit 52 is used to detect said carrier frequency point is greater than preset normalized crosscorrelation threshold value.
Initial ranging unit 53 is used for when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value said carrier frequency point being carried out initial ranging.
Further; Computation subunit can also be the time domain sequences that is used for to each PSS of the time domain sequences of a plurality of PSS, calculates the cross-correlation numerical value X of each sampled point of time-domain signal of time domain sequences and the carrier frequency point of i the pairing said PSS of reception antenna of UE respectively
i(d) and the magnitude of power Y of said each sampled point
i(d); D is the sampled point numbering of the time-domain signal of said carrier frequency point; The normalized crosscorrelation value is confirmed subelement, is used to calculate the correlation to said each sampled point of the time domain sequences of each PSS
Wherein I is the reception antenna number that said UE has, will be to the correlation of said each sampled point of the time domain sequences of said each PSS
In maximum as the signal normalization cross correlation value of said carrier frequency point.
The communication system frequency band search device that the embodiment of the invention provides; Adopt the computation subunit 511 of normalized crosscorrelation value acquiring unit 51 to confirm subelement 512 with the normalized crosscorrelation value; Obtain the normalized crosscorrelation value of carrier frequency point; Normalized crosscorrelation value according to carrier frequency point is judged with preset normalized crosscorrelation threshold value size, screens out the different system signal of part, has reduced time and number of times that UE carries out initial ranging.
Embodiment five
The embodiment of the invention also provides a kind of device of communication system frequency band search; Present embodiment is that example is explained with the LTE system; Shown in figure six, comprise normalized crosscorrelation value acquiring unit 61, the first frequency sequencing unit 65, detecting unit 62, initial ranging unit 63.
Normalized crosscorrelation value acquiring unit 61 is used for the normalization that the time-domain signal of time domain sequences and carrier frequency point through PSS carries out and handles, and obtains the signal normalization cross correlation value of said carrier frequency point.
The first frequency sequencing unit 65 sorts according to descending order to the signal normalization cross correlation value of a plurality of carrier frequency points of system's frequency range, obtains first frequency ordering of said carrier frequency point.
Detecting unit 62, whether the signal normalization cross correlation value that is used for detecting said carrier frequency point according to the ordering of first frequency is greater than preset normalized crosscorrelation threshold value.
Initial ranging unit 63 is used for when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value said carrier frequency point being carried out initial ranging.
Further, the another kind of device of the LTE system frequency band search that the embodiment of the invention provides, as shown in Figure 7, can also comprise: power measurement unit 66 is used to measure the power that belongs to all said carrier frequency point signals in the frequency range; With the second frequency sequencing unit 67, the signal power of a plurality of carrier frequency points is sorted according to descending order, obtain second frequency ordering of said a plurality of carrier frequency points.Like this when the signal normalization cross correlation value of said carrier frequency point is not more than said normalized crosscorrelation threshold value; Or said carrier frequency point does not search the LTE sub-district; Maybe can not carry out when resident the LTE sub-district that searches, whether the signal normalization cross correlation value that detecting unit detects said next carrier frequency point according to said second frequency ordering is greater than preset normalized crosscorrelation threshold value.Certainly, the watt level and the execution ordering that detect said carrier frequency point signal also can be carried out after obtaining the signal normalization cross correlation value of said carrier frequency point.
The communication system frequency band search device that the embodiment of the invention provides; Obtain the normalized crosscorrelation value of carrier frequency point; Signal normalization cross correlation value numerical values recited to all carrier frequency points sorts; Preferentially detect the big carrier frequency point of normalized crosscorrelation value, can further shorten the time and the number of times of UE initial ranging like this.
The LTE frequency band search device that the embodiment of the invention provides can be positioned at the LTE wireless receiver, in the LTE BBP.Be appreciated that the method that present embodiment provides is not only applicable to the LTE system, also can be applicable to the communication system that other has the Cell searching function, for example the PLMN system.
Further, the method for the LTE system frequency band search that the embodiment of the invention provides also can be used for the full frequency band search of PLMN (Public Land Mobile network, public land mobile network).When the normalized crosscorrelation value of this carrier frequency point is not more than preset normalized crosscorrelation threshold value, this carrier frequency point is not carried out initial ranging.Can shorten the full frequency band search time of PLMN like this.
The all or part of step that one of ordinary skill in the art will appreciate that realization said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.
Claims (10)
1. the method for a communication system frequency band search is characterized in that, comprising:
Normalization through the time-domain signal to the time domain sequences of master sync signal PSS and carrier frequency point carries out is handled, and obtains the signal normalization cross correlation value of said carrier frequency point;
Whether the signal normalization cross correlation value that detects said carrier frequency point is greater than preset normalized crosscorrelation threshold value;
When the signal normalization cross correlation value of said carrier frequency point during, said carrier frequency point is carried out initial ranging greater than said normalized crosscorrelation threshold value.
2. method according to claim 1 is characterized in that, the said normalization of carrying out through the time-domain signal to the time domain sequences of master sync signal PSS and carrier frequency point is handled, and the signal normalization cross correlation value that obtains said carrier frequency point comprises:
The cross-correlation numerical value X of each sampled point of the time domain sequences of the said PSS that i reception antenna of calculating user equipment (UE) is corresponding and the time-domain signal of carrier frequency point
i(d) and the magnitude of power Y of said each sampled point
i(d), d is the sampled point numbering of the time-domain signal of said carrier frequency point;
The correlation
that calculates said each sampled point wherein I is the number of the reception antenna that has of said UE, with the signal normalization cross correlation value of the maximum in the correlation
of said each sampled point as said carrier frequency point.
3. method according to claim 1 is characterized in that, the said normalization of carrying out through the time-domain signal to the time domain sequences of master sync signal PSS and carrier frequency point is handled, and the signal normalization cross correlation value that obtains said carrier frequency point comprises:
To the time domain sequences of each PSS in the time domain sequences of a plurality of PSS, calculate the cross-correlation numerical value X of each sampled point of time-domain signal of time domain sequences and the carrier frequency point of i the pairing said PSS of reception antenna of UE respectively
i(d) and the magnitude of power Y of said each sampled point
i(d); D is the sampled point numbering of the time-domain signal of said carrier frequency point;
Calculate to the correlation
of said each sampled point of the time domain sequences of each PSS wherein I be the reception antenna number that said UE has, will be to the signal normalization cross correlation value of the maximum in the correlation
of said each sampled point of the time domain sequences of said each PSS as said carrier frequency point.
4. according to each described method in the claim 1 to 3, it is characterized in that, also comprise:
When the signal normalization cross correlation value of said carrier frequency point is not more than said normalized crosscorrelation threshold value; Or do not search the LTE sub-district at said carrier frequency point; Maybe can not carry out when resident the LTE sub-district that searches; Obtain the time-domain signal of another carrier frequency point, and the time-domain signal of said another carrier frequency point is carried out said method.
5. according to the arbitrary described method of claim 1 to 4, it is characterized in that, also comprise:
Signal normalization cross correlation value to a plurality of carrier frequency points of system's frequency range sorts according to descending order, obtains first frequency ordering of said carrier frequency point;
Whether the signal normalization cross correlation value of the said carrier frequency point of said detection comprises greater than preset normalized crosscorrelation threshold value: whether the normalized crosscorrelation value that detects said carrier frequency point according to the ordering of first frequency is greater than preset normalized crosscorrelation value.
6. according to arbitrary described method in the claim 1 to 4, it is characterized in that, also comprise:
The signal power of a plurality of carrier frequency points of measuring system frequency range sorts according to descending order to the signal power of a plurality of carrier frequency points, obtains second frequency ordering of said carrier frequency point;
Whether the signal normalization cross correlation value of the said carrier frequency point of said detection comprises greater than preset normalized crosscorrelation threshold value: whether the normalized crosscorrelation value that detects said carrier frequency point according to the ordering of second frequency is greater than preset normalized crosscorrelation value.
7. the device of a communication system frequency band search is characterized in that, comprising:
Normalized crosscorrelation value acquiring unit is used for the normalization that the time-domain signal of time domain sequences and carrier frequency point through master sync signal PSS carries out and handles, and obtains the signal normalization cross correlation value of said carrier frequency point;
Detecting unit, whether the signal normalization cross correlation value that is used to detect said carrier frequency point is greater than preset normalized crosscorrelation threshold value;
The initial ranging unit is used for when the signal normalization cross correlation value of said carrier frequency point during greater than said normalized crosscorrelation threshold value said carrier frequency point being carried out initial ranging.
8. device according to claim 7 is characterized in that, said normalized crosscorrelation value acquiring unit comprises: computation subunit and normalized crosscorrelation value are confirmed subelement;
Said computation subunit is used to calculate the cross-correlation numerical value X of each sampled point of time-domain signal of time domain sequences and the carrier frequency point of the corresponding said PSS of i reception antenna of user equipment (UE)
i(d) and the magnitude of power Y of said each sampled point
i(d), d is the sampled point numbering of the time-domain signal of said carrier frequency point; Said normalized crosscorrelation value is confirmed subelement, is used to calculate the correlation of said each sampled point
Wherein I is the number of the reception antenna that has of said UE, with the correlation of said each sampled point
In maximum as the signal normalization cross correlation value of said carrier frequency point;
Perhaps said computation subunit is used for the time domain sequences to each PSS of the time domain sequences of a plurality of PSS, calculates the cross-correlation numerical value X of each sampled point of time-domain signal of time domain sequences and the carrier frequency point of i the pairing said PSS of reception antenna of UE respectively
i(d) and the magnitude of power Y of said each sampled point
i(d); D is the sampled point numbering of the time-domain signal of said carrier frequency point; Said normalized crosscorrelation value is confirmed subelement, is used to calculate the correlation to said each sampled point of the time domain sequences of each PSS
Wherein I is the reception antenna number that said UE has, will be to the correlation of said each sampled point of the time domain sequences of said each PSS
In maximum as the signal normalization cross correlation value of said carrier frequency point.
9. according to claim 7 or 8 described devices, it is characterized in that, also comprise:
The first frequency sequencing unit sorts according to descending order to the signal normalization cross correlation value of a plurality of carrier frequency points of system's frequency range, obtains first frequency ordering of said carrier frequency point;
Said detecting unit, whether the normalized crosscorrelation value that is used for detecting said carrier frequency point according to the ordering of first frequency is greater than preset normalized crosscorrelation value.
10. according to claim 7 or 8 described devices, it is characterized in that, also comprise:
Power measurement unit is used to measure the power that belongs to all carrier frequency point signals of frequency range;
The second frequency sequencing unit sorts according to descending order to the signal power of a plurality of carrier frequency points, obtains second frequency ordering of said a plurality of carrier frequency points;
Said detecting unit, whether the normalized crosscorrelation value that is used for detecting said carrier frequency point according to the ordering of second frequency is greater than preset normalized crosscorrelation value.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/078654 WO2012119403A1 (en) | 2011-08-19 | 2011-08-19 | Method and device of searching for frequency bands in communication system |
Publications (2)
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752831A (en) * | 2012-06-25 | 2012-10-24 | 华为技术有限公司 | Frequency band searching method and device |
| CN103327516A (en) * | 2013-05-21 | 2013-09-25 | 上海晨思电子科技有限公司 | Method and device for detecting main synchronizing signals |
| CN104581922A (en) * | 2013-10-23 | 2015-04-29 | 中兴通讯股份有限公司 | Method and device for realizing primary synchronization signal in time domain in LTE system |
| WO2016165624A1 (en) * | 2015-04-17 | 2016-10-20 | 索尼公司 | Terminal side and base station side device, terminal device, base station, and wireless communication method |
| CN106559857A (en) * | 2016-10-17 | 2017-04-05 | 华为技术有限公司 | A kind of method and device of priori frequency sequence |
| CN108966314A (en) * | 2017-05-26 | 2018-12-07 | 中国移动通信有限公司研究院 | A kind of network search method and device |
| CN111294889A (en) * | 2019-04-24 | 2020-06-16 | 锐迪科微电子（上海）有限公司 | Cell search method and device, storage medium and terminal |
| CN112153722A (en) * | 2020-09-23 | 2020-12-29 | Oppo广东移动通信有限公司 | Frequency point processing method and device, related equipment and storage medium |
| CN113453316A (en) * | 2021-06-22 | 2021-09-28 | Oppo广东移动通信有限公司 | Frequency point searching method, device and storage medium |
| WO2022061882A1 (en) * | 2020-09-28 | 2022-03-31 | 华为技术有限公司 | Cell search method, communication apparatus, readable storage medium, and chip system |
| CN115208733A (en) * | 2022-07-20 | 2022-10-18 | 成都华日通讯技术股份有限公司 | LTE and 5GNR signal joint identification method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013901A (en) * | 2007-02-14 | 2007-08-08 | 北京天碁科技有限公司 | Method and apparatus for cell search |
| CN101436900A (en) * | 2008-12-25 | 2009-05-20 | 重庆重邮信科通信技术有限公司 | Method and apparatus for scanning whole frequency band frequency point of advance system |
| US20100091642A1 (en) * | 2006-12-26 | 2010-04-15 | Yong-Suk Hwang | Apparatus of cell acquisition in wireless communication system and the method thereof |
| CN101938813A (en) * | 2009-06-30 | 2011-01-05 | 中兴通讯股份有限公司 | Method for combining secondary synchronization signal detection and synchronous frame timing |
| CN102045815A (en) * | 2009-10-10 | 2011-05-04 | 中国科学院计算技术研究所 | Cell searching device and method used for LTE (Long Term Evolution) system |
| CN102158249A (en) * | 2010-02-11 | 2011-08-17 | 富士通株式会社 | Method and device for detecting a master synchronization sequence |
-
2011
- 2011-08-19 WO PCT/CN2011/078654 patent/WO2012119403A1/en active Application Filing
- 2011-08-19 CN CN201180001788.2A patent/CN102356671B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100091642A1 (en) * | 2006-12-26 | 2010-04-15 | Yong-Suk Hwang | Apparatus of cell acquisition in wireless communication system and the method thereof |
| CN101013901A (en) * | 2007-02-14 | 2007-08-08 | 北京天碁科技有限公司 | Method and apparatus for cell search |
| CN101436900A (en) * | 2008-12-25 | 2009-05-20 | 重庆重邮信科通信技术有限公司 | Method and apparatus for scanning whole frequency band frequency point of advance system |
| CN101938813A (en) * | 2009-06-30 | 2011-01-05 | 中兴通讯股份有限公司 | Method for combining secondary synchronization signal detection and synchronous frame timing |
| CN102045815A (en) * | 2009-10-10 | 2011-05-04 | 中国科学院计算技术研究所 | Cell searching device and method used for LTE (Long Term Evolution) system |
| CN102158249A (en) * | 2010-02-11 | 2011-08-17 | 富士通株式会社 | Method and device for detecting a master synchronization sequence |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752831B (en) * | 2012-06-25 | 2014-01-08 | 华为技术有限公司 | Frequency band searching method and device |
| CN102752831A (en) * | 2012-06-25 | 2012-10-24 | 华为技术有限公司 | Frequency band searching method and device |
| CN103327516B (en) * | 2013-05-21 | 2017-04-12 | 上海晨思电子科技有限公司 | Method and device for detecting main synchronizing signals |
| CN103327516A (en) * | 2013-05-21 | 2013-09-25 | 上海晨思电子科技有限公司 | Method and device for detecting main synchronizing signals |
| US9444610B2 (en) | 2013-05-21 | 2016-09-13 | Mstar Semiconductor, Inc. | Method and device for detecting primary synchronization signal |
| TWI551171B (en) * | 2013-05-21 | 2016-09-21 | 晨星半導體股份有限公司 | Method and device for detecting primary synchronization signal |
| CN104581922B (en) * | 2013-10-23 | 2019-06-18 | 中兴通讯股份有限公司 | The method and apparatus that primary synchronization signal is realized in time domain in a kind of LTE system |
| CN104581922A (en) * | 2013-10-23 | 2015-04-29 | 中兴通讯股份有限公司 | Method and device for realizing primary synchronization signal in time domain in LTE system |
| US10903926B2 (en) | 2015-04-17 | 2021-01-26 | Sony Corporation | Terminal side and base station side device, terminal device, base station, and wireless communication method |
| WO2016165624A1 (en) * | 2015-04-17 | 2016-10-20 | 索尼公司 | Terminal side and base station side device, terminal device, base station, and wireless communication method |
| US10348435B2 (en) | 2015-04-17 | 2019-07-09 | Sony Corporation | Terminal side and base station side device, terminal device, base station, and wireless communication method |
| CN106559857B (en) * | 2016-10-17 | 2020-05-08 | 华为技术有限公司 | Method and device for sequencing prior frequency points |
| CN106559857A (en) * | 2016-10-17 | 2017-04-05 | 华为技术有限公司 | A kind of method and device of priori frequency sequence |
| CN108966314A (en) * | 2017-05-26 | 2018-12-07 | 中国移动通信有限公司研究院 | A kind of network search method and device |
| CN111294889A (en) * | 2019-04-24 | 2020-06-16 | 锐迪科微电子（上海）有限公司 | Cell search method and device, storage medium and terminal |
| CN111294889B (en) * | 2019-04-24 | 2022-06-24 | 锐迪科微电子（上海）有限公司 | Cell search method and device, storage medium and terminal |
| CN112153722A (en) * | 2020-09-23 | 2020-12-29 | Oppo广东移动通信有限公司 | Frequency point processing method and device, related equipment and storage medium |
| WO2022061882A1 (en) * | 2020-09-28 | 2022-03-31 | 华为技术有限公司 | Cell search method, communication apparatus, readable storage medium, and chip system |
| CN114586418A (en) * | 2020-09-28 | 2022-06-03 | 华为技术有限公司 | Cell search method, communication device, readable storage medium and chip system |
| CN113453316A (en) * | 2021-06-22 | 2021-09-28 | Oppo广东移动通信有限公司 | Frequency point searching method, device and storage medium |
| CN115208733A (en) * | 2022-07-20 | 2022-10-18 | 成都华日通讯技术股份有限公司 | LTE and 5GNR signal joint identification method |
| CN115208733B (en) * | 2022-07-20 | 2024-02-13 | 成都华日通讯技术股份有限公司 | LTE and 5GNR signal joint identification method |
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| Publication number | Publication date |
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| CN102356671B (en) | 2013-12-18 |
| WO2012119403A1 (en) | 2012-09-13 |
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