CN110519196A - Search for method, computer readable storage medium and the small base station of Physical Cell Identifier - Google Patents
Search for method, computer readable storage medium and the small base station of Physical Cell Identifier Download PDFInfo
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- CN110519196A CN110519196A CN201910745995.7A CN201910745995A CN110519196A CN 110519196 A CN110519196 A CN 110519196A CN 201910745995 A CN201910745995 A CN 201910745995A CN 110519196 A CN110519196 A CN 110519196A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
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Abstract
The present invention is suitable for the communications field, provides a kind of method, computer readable storage medium and small base station for searching for Physical Cell Identifier.The described method includes: being conjugated symmetrical feature using PSS sequence time domain mirror image, strongest PSS signal location is determined using sliding correlation method, and the most strong SSB beam position in current area is finally determined by most strong PSS signal location；Feature is shifted in frequency-domain circular using different PSS sequences, seeks receiving represented by PSS sequence in frequency domainPresent invention reduces receiving in signal there are the error probability of search most strong SSB wave beam when carrier wave frequency deviation, reduces and be directly respectively adopted that three local PSS sequences are related with the wireless frame slip of reception to be sought in the time domainWhen bring operand.
Description
Technical field
The invention belongs to the communications field more particularly to a kind of methods for searching for Physical Cell Identifier, computer-readable storage
Medium and small base station.
Background technique
5G NR (New Radio, newly eat dishes without rice or wine) mobile communications network typical case scene demand is low time delay, large capacity, ten thousand
Object interconnection.The base station NR facility network arrange net in the world by construction at present, and domestic administrative department has also given operator
It provides 5G licence plate and formally carries out 5G commercialization.5G is wanted due to its relatively high carrier wave feature, coverage area compared to traditional base station
It is small, it is especially deployed in the base station 5G on millimeter wave frequency band, operation wavelength is worse to the penetration capacity of barrier, base station covering
Radius is smaller.It is contemplated that 5G network need to build huge small base station come to macro base station carry out signal covering mend it is blind, so
The operational area covering that can complete operator, especially in the urban environment of complicated condition.
When small base station is arranged net, first has to obtain radio frame boundaries timing information, listen to the broadcast of macro base station, thus obtain week
Enclose the site information there are macro base station.Small base station will complete these functions, need to carry out cell searching, this and terminal are in booting
It is similar to obtain the cell searching course of work carried out needed for cell information.NR standard agreement due to having faced new application scenarios,
In the formulation of the frame format of cell synchronous and broadcast message, standard agreement different from the past, and show its exclusive technology
Feature.New cell acquisition methods can be designed according to NR synchronization and the technical characterstic of broadcast module.NR synchronization signal designs
Primary synchronization signal (Primary Synchronization Signal, PSS) and secondary synchronization signal (Secondary
Synchronization Signal, SSS), PSS and SSS using M sequence, with LTE (Long Term Evolution,
Long term evolution) the ZC sequence that uses of systems times is different.In addition, the synchronizing sequence of NR and Physical Broadcast Channel (Physical
Broadcast Channel, PBCH) it is also very different with LTE on the position of running time-frequency resource, PBCH resource is reflected on NR
It penetrates more compact, forms a synchronization signal block (SS/PBCHBlock, SSB), this design feature makes terminal rapider
Be linked into NR network, reduce access system time delay.
Cell searching detection is firstly the need of progress radio frame synchronization.Either LTE network or NR network, common nothing
Line frame synchornization method is all that signal is received on cell operation frequency point, then to signal progress low-pass filtering is received, filters out synchronization
Signal out of band signal；Then using the three groups of PSS sequence time-domain signals locally generated, phase is sought with the reception signal after low pass one by one
Operation is closed, three groups of correlated results are obtained；Absolute value is asked to three groups of correlated results, and seeks every group of maximum absolute value value, obtains three
Value；Finally the maximizing in three values, position representated by maximum value are the position PSS for receiving signal, it is possible thereby to really
Frame boundary, the position SSS and the position PBCH.The cell ID that current PSS is represented can be acquired according to that group number in the source PSS
Serial numberAnd it is sought present in system according to the PSS group sequence of confirmation with phase difference existing for received PSS sequence
Frequency departure, to eliminate the frequency offset error received in signal.And then ask related to SSS sequence is received according to local SSS sequence
Peak value is simultaneously judged, is acquired the SSS sequence for receiving and using in signal, is thus acquired group ID serial number representated by SSS sequencePhysical Cell Identifier (Physical Cell Identifier, PCI) is finally acquired,
In above-mentioned cell search process, detection for PSS sequence needs three groups of local formation sequences, one by one with reception
Sequence carries out sliding related operation, then seek maximum value determine using which organize PSS sequence, it is this directly in the time domain
The method operand that PSS sequence is retrieved using sliding correlation method is larger.On the other hand, using the sequence and reception locally generated
Signal do the relevant method of sliding, since there is no undergo identical channel shadow with received signal for the sequence that locally generates
It rings, therefore the frequency offset error estimated can relatively large, leads to receive in signal that there are most strong SSB wave is searched for when carrier wave frequency deviation
The error probability of beam is high.
Summary of the invention
The method of Physical Cell Identifier, computer readable storage medium and small are searched for the purpose of the present invention is to provide a kind of
Base station, it is intended to which the method for solving the search Physical Cell Identifier of the prior art is directly retrieved using sliding correlation method in the time domain
The method operand of PSS sequence is larger, and there are the error probability of search most strong SSB wave beam when carrier wave frequency deviation is high in reception signal
The problem of.
In a first aspect, the present invention provides a kind of methods for searching for Physical Cell Identifier, which comprises
S101, when searching for the position primary synchronization signal PSS and when the secondary synchronization signal position SSS, using two intervals it is default away from
From friendship frequency division multiplex OFDM symbol carry out sliding related operation, seek sliding correlated results maximum value, determination participate at this time
Slide the location of two PSS sequences and the difference of related operation；
S102, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, calculates separately two
Half sign-inverted correlation of PSS sequence, and the maximum value of half sign-inverted correlation is sought, by half sign-inverted correlation
PSS sequence where maximum value determines that two PSS sequences distinguish institute as PSS signal most strong in the SSB beam signal of current area
The location of most strong PSS signal in the position at place；The position PSS is determined by the location of most strong PSS signal, and according to PSS
Position determines the position SSS；
S103, the PSS time-domain signal that the position PSS locating for the PSS time-domain signal received is extracted is transformed into frequency domain
PSS frequency-region signal is obtained, it is corresponding when the PSS frequency-region signal received and the cell ID serial number that local current PSS is represented are equal to 0
PSS frequency domain sequence to carry out cyclic shift sliding related, the position of maximum correlation peaks is sought, according to the position of maximum correlation peaks
The judgement cell ID serial number that the corresponding current PSS of received PSS frequency-region signal is represented at this time is set, SSS sequence is determined according to the position SSS
The representative group ID serial number of column, and the group ID serial number according to representated by the cell ID serial number and SSS sequence that current PSS is represented acquires
The Physical Cell Identifier of current area.
Further, S101 is specifically included:
S1011, according to work at present centre frequency, determine in synchronization signal block SSB subcarrier spacing and SSB transmission time slot
The OFDM symbol number N at two intervals SSB, and then determine the time domain length L and circulating prefix-length CP of an OFDM symbol, in turn
Determine sliding interval D=N* (L+CP) of two PSS sequences；According to subcarrier spacing, the passband band of SSB low-pass filter is determined
It is wide；N is natural number；
S1012, predetermined period data are received and obtain filtered data through SSB low-pass filter progress low-pass filtering
Data, calculating filtered data Data length is data_length, if variable first_pss_start indicates the first data
Initial position, if variable second_pss_start indicates Article 2 data start；If variable i instruction sliding increases, if
Initial value i=0；If array corr [data_length-D] is used to save the sliding correlation knot of the first data and the second data
Fruit；Data_length-D refers to that filtered data Data length subtracts the sliding interval D of two PSS sequences；
S1013, first_pss_start=first_pss_start+i is enabled, using first_pss_start as start bit
It sets interception filtered data Data and obtains the first data PSS_FIRST, data length L；Enable second_pss_start=
First_pss_start+D intercepts filtered data Data as initial position using second_pss_start and obtains Article 2 number
According to PSS_SECOND, data length L；It is related to the second data PSS_SECOND absolutely to calculate the first data PSS_FIRST
To value, result is saved in corr [i]；Enable i=i+1；
S1014, the value for judging i, if i is more than or equal to filtered data Data length and subtracts two PSS sequences
Interval D is slided, then executes S1015, otherwise returns to S1013；
S1015, the maximum value for seeking sliding correlated results corr determine the previous item for participating in sliding related operation at this time
PSS sequence PSS_FRONT and present position pss_front_position and latter PSS sequence PSS_BACK and locating position
Set pss_back_position.
Further, S102 is specifically included:
S1021, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, before calculating separately
One PSS sequence PSS_FRONT and the latter respective half sign-inverted correlation of PSS sequence PSS_BACK, and seek half symbol
The maximum value of number reversion correlation, using PSS sequence where the maximum value of half sign-inverted correlation as current area SSB wave beam
Most strong PSS signal in signal, and determine the location of most strong PSS signal in two PSS sequence difference locations, by most
The location of strong PSS signal determines PSS time-domain signal present position pss_ in the received filtered data Data in current area
location；SSS time-domain signal and its present position sss_ are determined according to PSS time-domain signal present position pss_location
Location=pss_location+2* (L+CP).
Further, S103 is specifically included:
S1031, the PSS in filtered data is extracted from the PSS time-domain signal present position pss_location received
Time-domain signal simultaneously carries out FFT time-frequency convert, obtains received PSS frequency-region signal；
S1032, the cell ID serial number for representing received PSS frequency-region signal and local current PSSIt is corresponding when equal to 0
PSS frequency domain sequence to carry out cyclic shift sliding related, seek the position of maximum correlation peaks；
S1033, SSS time domain letter is extracted from filtered data according to SSS time-domain signal present position sss_location
Number, and be FFT and obtain SSS frequency-region signal, by obtained SSS frequency-region signal withIt is worth corresponding local SSS frequency domain sequence
It is related one by one, the SSS call number in maximum related value source is sought, group ID serial number representated by SSS sequence is obtainedFinally ask
Obtain currently optimal coverage cell
Further, before S103, the method also includes:
It calculates and receives carrier wave frequency deviation present in data, and carrier wave frequency deviation described in compensation data is received, obtain compensation and carry
Wave frequency data to the rear；
The filtered data in the S1031 and S1033 is the data compensated after carrier wave frequency deviation.
Second aspect, the present invention provides a kind of computer readable storage medium, the computer readable storage medium is deposited
Computer program is contained, search physical area mark as described in relation to the first aspect is realized when the computer program is executed by processor
The step of method of knowledge.
The third aspect, the present invention provides a kind of small base stations, comprising:
One or more processors；
Memory；And
One or more computer programs, the processor and the memory are connected by bus, wherein one
Or multiple computer programs are stored in the memory, and are configured to be executed by one or more of processors,
The processor realizes the step of the method for search Physical Cell Identifier as described in relation to the first aspect when executing the computer program
Suddenly.
In the present invention, it due to being conjugated symmetrical feature using PSS sequence time domain mirror image, is determined most using sliding correlation method
Strong PSS signal location, and the most strong SSB beam position in current area is finally determined by most strong PSS signal location, reduce reception
There are the error probabilities of search most strong SSB wave beam when carrier wave frequency deviation in signal；Again due to being followed using different PSS sequences in frequency domain
Ring shifts feature, seeks receiving represented by PSS sequence in frequency domainReduce and three are directly respectively adopted in the time domain
The local PSS sequence is related to wireless frame slip is received to be soughtWhen bring operand；Again since the method also includes meters
It calculates and receives carrier wave frequency deviation present in data, and carrier wave frequency deviation described in compensation data is received, after obtaining compensation carrier wave frequency deviation
Data, therefore reduce the error detection probability of physical cell identity PCI.
Detailed description of the invention
Fig. 1 is the schematic diagram of NR SSB time-frequency structure.
When Fig. 2 is that SCS is equal to 15KHz, repetition situation schematic diagram of the SSB in 5ms half frame period.
Fig. 3 is that PSS symbol sebolic addressing time domain mirror image is conjugated symmetrical schematic diagram.
Fig. 4 is that PSS frequency domain sequence existsWhen, respectively withShi HeWhen frequency domain sequence recycle slide
Dynamic computing cross-correlation result schematic diagram.
Fig. 5 is the flow chart of the method for the search Physical Cell Identifier that the embodiment of the present invention one provides.
Fig. 6 is to search for the position PSS and SSS in the method for the search Physical Cell Identifier that the embodiment of the present invention one provides
The schematic diagram set.
Fig. 7 is the specific block diagram for the small base station that the embodiment of the present invention three provides.
Specific embodiment
In order to which the purpose of the present invention, technical solution and beneficial effect is more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one:
Referring to Fig. 1, the SSB of 5G NR occupies 240 number of subcarriers on frequency domain, 4 OFDM symbols are occupied in the time domain
Number.56th to the 182nd son of first OFDM symbol and third OFDM symbol that wherein PSS and SSS is respectively at SSB carries
Wave position.Cell synchronous search process seeks to the position for searching out PSS and SSS, and is determined by the information that PSS and SSS is carried
The PCI of current area.
SSB is in different carrier wave frequency ranges, different subcarrier spacings (Subcarrier Space, SCS), different time-gap
Repeat number can be different, this make detect SSB in PSS sequence when, to consider that distance can be according to different fields between PSS sequence
Scape and change.The transmitting of SSB in the time domain has used BeamSweep (beam scanning) technology, and the technology is in half frame period
It is interior, it can configure by multiple SSB wave beam formings to multiple and different directions, it is expected that terminal can obtain region base station beam
Best coverage direction.Number of repetition of the SSB in half frame period, the configuration different from NR system is related, minimum number of repetition
It is 4 times, is up to 64 times, duplicate multiple SSB in half frame period forms SSB collection.Different SSB is configured, SSB transmitting
At least there are 2 SSB in time slot, and the spacing distance of at least 2 SSB is fixed, this interval in a time slot
Distance can be determined by the work centre frequency point of NR system, be equal to N number of OFDM symbol duration, and N value is 4 or 6.
Protocol definition SSB has 5 subcarrier spacings, it is meant that the PSS sequence OFDM symbol length in SSB time domain may
There are 5 kinds.PSS time domain symbol sequence mirror image conjugate symmetry matter, refers to: setting the points of PSS time domain symbol sequence IFFT transformation
It is a symbol sebolic addressing in time domain, i.e. PSS_time={ a (0), a (1), a (3) ... a (N-3), a (N- for N, PSS_time
2), a (N-1) }, then there is a (1)=a*(N-1), a (2)=a*..., (N-2), a (N/2-2)=a*(N/2+2),a(N/2-1)
=a*(N/2+1), i.e. PSS_time={ a (0), a (1), a (2), (3) ... a (N/2-2), a (N/2-1), a (N/2), a
(N/2-1)*,a(N/2-2)*......a(3)*,a(2)*,a(1)*, wherein ()*To take conjugate operation.Fig. 2 shows that SCS is equal to
Repetition situation of the SSB in half frame period when 15KHz, a time slot is equal to 1ms at this time.Fig. 3 is PSS symbol sebolic addressing time domain mirror image
It is conjugated symmetrical schematic diagram, N is the IFFT point number of OFDM symbol, and CP is the cyclic prefix of OFDM symbol.
The cell ID serial number that the corresponding current PSS of the frequency domain sequence that PSS is locally generated is representedThree values 0,1,
2, it is substantially to be shifted by same M series of cycles, according to this characteristic, cross correlation results show as same sequence
Cyclic shift.According to protocol definition,When corresponding PSS frequency domain sequence, Ke YiyouWhen corresponding PSS frequency
Obtained by domain sequence loops are 43 mobile,When corresponding PSS frequency domain sequence, byWhen corresponding PSS frequency domain
Obtained by sequence loops are 86 mobile, using the PSS frequency domain sequence received and localCorresponding PSS frequency domain sequence
It asks circulation sliding related, and peaking position, can judge that the PSS being currently received is correspondingValue.Fig. 4 is PSS frequency domain
Sequence existsWhen, respectively withShi HeWhen frequency domain sequence circulation sliding computing cross-correlation result.
The generation of 5G NR SSS sequence, with PSS sequenceValue is related, and generating process is as follows:
dsss(n)=[1-2x0((n+m0)mod127)][1-2x1((n+m1)mod127)],0≤n≤127
Wherein x0And x1It is two M sequences.
It can see from the generating process of NR SSS sequence, PSS sequenceValue influence whether the generation of SSS sequence
As a result.Value has 336 kinds of possibility, i.e.,In this way, eachIt is worth corresponding 336 SSS sequences,
This will be so that detectingAfterwards, it needs to detect from its corresponding 336 SSS sequenceValue.
Referring to Fig. 5, the method for the search Physical Cell Identifier that the embodiment of the present invention one provides is the following steps are included: need to infuse
Meaning, if having substantially the same as a result, the method for search Physical Cell Identifier of the invention is not with process shown in fig. 5
Sequence is limited.
S101, when searching for the position PSS and when the position SSS, the OFDM symbol for being spaced pre-determined distances using two is slided
Related operation seeks the maximum value of sliding correlated results, determines the two PSS sequences and difference for participating in sliding related operation at this time
Location.
S102, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, calculates separately two
Half sign-inverted correlation of PSS sequence, and the maximum value of half sign-inverted correlation is sought, by half sign-inverted correlation
PSS sequence where maximum value determines that two PSS sequences distinguish institute as PSS signal most strong in the SSB beam signal of current area
The location of most strong PSS signal in the position at place；The position PSS is determined by the location of most strong PSS signal, and according to PSS
Position determines the position SSS.
Calculate separately the half sign-inverted correlation of two PSS sequences specifically:
For every PSS sequence, it is respectively adopted after the later half sequence inverted order arrangement of PSS sequence and first half sequence phase one by one
Multiply and sum and takes absolute value.
S103, the PSS time-domain signal that the position PSS locating for the PSS time-domain signal received is extracted is transformed into frequency domain
PSS frequency-region signal is obtained, it is corresponding when the PSS frequency-region signal received and the cell ID serial number that local current PSS is represented are equal to 0
PSS frequency domain sequence to carry out cyclic shift sliding related, the position of maximum correlation peaks is sought, according to the position of maximum correlation peaks
The judgement cell ID serial number that the corresponding current PSS of received PSS frequency-region signal is represented at this time is set, SSS sequence is determined according to the position SSS
The representative group ID serial number of column, and the group ID serial number according to representated by the cell ID serial number and SSS sequence that current PSS is represented acquires
The Physical Cell Identifier of current area.
In the embodiment of the present invention one, S101 can specifically include following steps:
S1011, according to work at present centre frequency, determine in SSB subcarrier spacing and SSB transmission time slot between two SSB
Every OFDM symbol number N, and then determine an OFDM symbol time domain length L and circulating prefix-length CP, and then determine two
The sliding interval D of PSS sequence=N* (L+CP)；According to subcarrier spacing, the pass band width of SSB low-pass filter is determined；N is certainly
So number；
S1012, predetermined period data are received and obtain filtered data through SSB low-pass filter progress low-pass filtering
Data, calculating filtered data Data length is data_length, if variable first_pss_start indicates the first data
Initial position, if variable second_pss_start indicates Article 2 data start；If variable i instruction sliding increases, if
Initial value i=0；If array corr [data_length-D] is used to save the sliding correlation knot of the first data and the second data
Fruit；The predetermined period data are equal to or greater than 1 wireless frame period data or are equal to or more than the half frame period of 5ms
Data, 1 wireless frame period data are the data of 10ms；Data_length-D refers to that filtered data Data length subtracts two
The sliding interval D of PSS sequence；
S1013, first_pss_start=first_pss_start+i is enabled, using first_pss_start as start bit
It sets interception filtered data Data and obtains the first data PSS_FIRST, data length L；Enable second_pss_start=
First_pss_start+D intercepts filtered data Data as initial position using second_pss_start and obtains Article 2 number
According to PSS_SECOND, data length L；It is related to the second data PSS_SECOND absolutely to calculate the first data PSS_FIRST
To value, result is saved in corr [i]；Enable i=i+1；
In S1013, calculate related to the second data PSS_SECOND absolute value of the first data PSS_FIRST it
Afterwards, can with the following steps are included:
Energy normalized is carried out to related absolute value.
S1014, the value for judging i, if i is more than or equal to filtered data Data length and subtracts two PSS sequences
Interval D is slided, then executes S1015, otherwise returns to S1013；
S1015, the maximum value for seeking sliding correlated results corr determine the previous item for participating in sliding related operation at this time
PSS sequence PSS_FRONT and present position pss_front_position and latter PSS sequence PSS_BACK and locating position
Set pss_back_position.
After S1015, the method can with the following steps are included:
The maximum value stored in correlated results corr will be slided compared with predetermined threshold value, if maximum value is less than pre- gating
Limit value then returns to S1011, otherwise executes S102.Predetermined threshold value is determined by engineering experience.
S102 can specifically include following steps:
S1021, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, before calculating separately
One PSS sequence PSS_FRONT and the latter respective half sign-inverted correlation of PSS sequence PSS_BACK, and seek half symbol
The maximum value of number reversion correlation, using PSS sequence where the maximum value of half sign-inverted correlation as current area SSB wave beam
Most strong PSS signal in signal, and determine the location of most strong PSS signal in two PSS sequence difference locations, by most
The location of strong PSS signal determines PSS time-domain signal present position pss_ in the received filtered data Data in current area
location；SSS time-domain signal and its present position sss_ are determined according to PSS time-domain signal present position pss_location
Location=pss_location+2* (L+CP).
Please refer to the schematic diagram that Fig. 6 is S1012 to the S1021 search position PSS and the position SSS.
S103 can specifically include following steps:
S1031, the PSS in filtered data is extracted from the PSS time-domain signal present position pss_location received
Time-domain signal simultaneously carries out FFT time-frequency convert, obtains received PSS frequency-region signal；
S1032, by received PSS frequency-region signal and localCorresponding PSS frequency domain sequence carries out circulation shifting when equal to 0
Position sliding is related, seeks the position of maximum correlation peaks, if the position of maximum correlation peaks is equal to a certain in { 127,0,1 }
A value, then received PSS frequency-region signal is corresponding at this timeEqual to 0；If the position of maximum correlation peaks be equal to 42,43,
44 } some value in, then received PSS frequency-region signal PSS is corresponding at this timeEqual to 1；If maximum correlation peaks
Position is equal to some value in { 85,86,87 }, then received PSS frequency-region signal is corresponding at this timeEqual to 2；
S1033, SSS time domain letter is extracted from filtered data according to SSS time-domain signal present position sss_location
Number, and be FFT and obtain SSS frequency-region signal, by obtained SSS frequency-region signal withIt is worth corresponding local SSS frequency domain sequence
It is related one by one, the SSS call number in maximum related value source is sought, is obtainedFinally acquire current optimal coverage cell
Before S103, the method can with the following steps are included:
It calculates and receives carrier wave frequency deviation present in data, and carrier wave frequency deviation described in compensation data is received, obtain compensation and carry
Wave frequency data to the rear, to eliminate the influence for receiving carrier wave frequency deviation in data.
It is specifically as follows: according to previous PSS sequence PSS_FRONT and latter PSS sequence PSS_BACK, using time domain
Phase deviation method carries out Nonlinear Transformation in Frequency Offset Estimation and obtains carrier deviation value CFO, and the filtered data received is compensated using CFO
Data, the data Data_new after obtaining compensation carrier wave frequency deviation.
Alternatively,
Previous PSS sequence PSS_FRONT and present position using the participation sliding related operation determined in S1015
Pss_front_position and latter PSS sequence PSS_BACK and present position pss_back_position, and by
The time domain repetition period property of SSB 10ms in radio frames, seeks multiple carrier deviation value CFO in N number of 10ms wireless frame period,
And the average value of CFO is sought, the filtered data Data received is compensated using the average value of CFO, obtains compensation carrier wave frequency deviation
Data Data_new afterwards.
Alternatively,
Using SSS time-domain signal fixed in S1021 and its present position, carrier wave is carried out using time domain phase deviation method
Offset estimation obtains carrier deviation value CFO, and the filtered data Data received is compensated using CFO, obtains compensation carrier wave frequency deviation
Data Data_new afterwards.
Alternatively,
Using SSS time-domain signal fixed in S1021 and its present position, and by SSB in radio frames 10ms when
Domain repetition period property seeks multiple carrier deviation value CFO in N number of 10ms wireless frame period, and seeks the average value of CFO, adopts
The filtered data Data received is compensated with the average value of CFO, the data Data_new after obtaining compensation carrier wave frequency deviation.
Alternatively,
Previous PSS sequence PSS_FRONT and present position using the participation sliding related operation determined in S1015
Pss_front_position and latter PSS sequence PSS_BACK and present position pss_back_position, and by
The time domain repetition period property of SSB 10ms in radio frames, seeks multiple carrier deviation value CFO in N number of 10ms wireless frame period；
Week is repeated using SSS time-domain signal fixed in S1021 and its present position, and by the time domain of SSB 10ms in radio frames
Phase property seeks multiple carrier deviation value CFO in N number of 10ms wireless frame period；And the average value of all CFO is sought, using CFO
Average value compensate the filtered data Data that receives, the data Data_new after obtaining compensation carrier wave frequency deviation.
Then, the filtered data in S1031 and S1033 is the data Data_new compensated after carrier wave frequency deviation.
Embodiment two:
Second embodiment of the present invention provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is computer program, realizes that the search physics provided such as the embodiment of the present invention one is small when the computer program is executed by processor
The step of method of area's mark.
Embodiment three:
Fig. 7 shows the specific block diagram of the small base station of the offer of the embodiment of the present invention three, and a kind of small base station 100 includes:
One or more processors 101, memory 102 and one or more computer programs, wherein the processor 101 and institute
Memory 102 to be stated to connect by bus, one or more of computer programs are stored in the memory 102, and
It is configured to be executed by one or more of processors 101, the processor 101 is realized such as when executing the computer program
The step of method for the search Physical Cell Identifier that the embodiment of the present invention one provides.
In the present invention, it due to being conjugated symmetrical feature using PSS sequence time domain mirror image, is determined most using sliding correlation method
Strong PSS signal location, and the most strong SSB beam position in current area is finally determined by most strong PSS signal location, reduce reception
There are the error probabilities of search most strong SSB wave beam when carrier wave frequency deviation in signal；Again due to being followed using different PSS sequences in frequency domain
Ring shifts feature, seeks receiving represented by PSS sequence in frequency domainReduce and three are directly respectively adopted in the time domain
The local PSS sequence is related to wireless frame slip is received to be soughtWhen bring operand；Again since the method also includes meters
It calculates and receives carrier wave frequency deviation present in data, and carrier wave frequency deviation described in compensation data is received, after obtaining compensation carrier wave frequency deviation
Data, therefore reduce the error detection probability of physical cell identity PCI.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of method for searching for Physical Cell Identifier, which is characterized in that the described method includes:
S101, when searching for the position primary synchronization signal PSS and when the secondary synchronization signal position SSS, be spaced pre-determined distance using two
It hands over frequency division multiplex OFDM symbol to carry out sliding related operation, seeks the maximum value of sliding correlated results, determine and participate in sliding at this time
Two PSS sequences of related operation and respectively location；
S102, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, calculates separately two PSS
Half sign-inverted correlation of sequence, and the maximum value of half sign-inverted correlation is sought, most by half sign-inverted correlation
PSS sequence where big value determines locating for two PSS sequences difference as PSS signal most strong in the SSB beam signal of current area
Position in the location of most strong PSS signal；The position PSS is determined by the location of most strong PSS signal, and according to PSS
Set the determining position SSS；
S103, it the PSS time-domain signal that the position PSS locating for the PSS time-domain signal received is extracted is transformed into frequency domain obtains
PSS frequency-region signal, it is corresponding when the PSS frequency-region signal received and the cell ID serial number that local current PSS is represented are equal to 0
PSS frequency domain sequence carries out cyclic shift sliding correlation, the position of maximum correlation peaks is sought, according to the position of maximum correlation peaks
The judgement cell ID serial number that the corresponding current PSS of received PSS frequency-region signal is represented at this time, determines SSS sequence according to the position SSS
Representative group ID serial number, and the group ID serial number according to representated by the cell ID serial number and SSS sequence that current PSS is represented acquires and works as
The Physical Cell Identifier of preceding cell.
2. the method as described in claim 1, which is characterized in that S101 is specifically included:
S1011, according to work at present centre frequency, determine in synchronization signal block SSB subcarrier spacing and SSB transmission time slot two
The OFDM symbol number N at the interval SSB, and then determine the time domain length L and circulating prefix-length CP of an OFDM symbol, and then determine
The sliding interval D of two PSS sequences=N* (L+CP)；According to subcarrier spacing, the pass band width of SSB low-pass filter is determined；N
It is natural number；
S1012, predetermined period data are received and obtain filtered data Data through SSB low-pass filter progress low-pass filtering, counted
Calculation filtered data Data length is data_length, if variable first_pss_start indicates the first data start bit
It sets, if variable second_pss_start indicates Article 2 data start；If variable i instruction sliding increases, if initial value i=
0；If array corr [data_length-D] is used to save the sliding correlated results of the first data and the second data；data_
Length-D refers to that filtered data Data length subtracts the sliding interval D of two PSS sequences；
S1013, first_pss_start=first_pss_start+i is enabled, is cut by initial position of first_pss_start
Filtered data Data is taken to obtain the first data PSS_FIRST, data length L；Enable second_pss_start=
First_pss_start+D intercepts filtered data Data as initial position using second_pss_start and obtains Article 2 number
According to PSS_SECOND, data length L；It is related to the second data PSS_SECOND absolutely to calculate the first data PSS_FIRST
To value, result is saved in corr [i]；Enable i=i+1；
S1014, the value for judging i, if i is more than or equal to the sliding that filtered data Data length subtracts two PSS sequences
Interval D then executes S1015, otherwise returns to S1013；
S1015, the maximum value for seeking sliding correlated results corr determine previous PSS sequence for participating in sliding related operation at this time
Arrange PSS_FRONT and present position pss_front_position and latter PSS sequence PSS_BACK and present position
pss_back_position。
3. method according to claim 2, which is characterized in that the predetermined period data are equal to or greater than 1 radio frames
Cycle data is either equal to or more than the half frame period data of 5ms, and 1 wireless frame period data is the data of 10ms；
The half sign-inverted correlation for calculating separately two PSS sequences specifically:
For every PSS sequence, it is respectively adopted after the later half sequence inverted order arrangement of PSS sequence and is multiplied one by one simultaneously with first half sequence
Summation takes absolute value.
4. method according to claim 2, which is characterized in that in S1013, calculate the first data PSS_FIRST and the
After two data PSS_SECOND correlation absolute values, further includes:
Energy normalized is carried out to related absolute value；
After S1015, the method also includes:
The maximum value stored in correlated results corr will be slided compared with predetermined threshold value, if maximum value is less than pre-determined threshold
Value, then return to S1011, otherwise execute S102.
5. such as the described in any item methods of claim 2 to 4, which is characterized in that S102 is specifically included:
S1021, the symmetrical characteristic of mirror image conjugation is presented by origin of symbol center according to PSS sequence, calculates separately previous item
PSS sequence PSS_FRONT and the latter respective half sign-inverted correlation of PSS sequence PSS_BACK, and it is anti-to seek half symbol
The maximum value for turning correlation, using PSS sequence where the maximum value of half sign-inverted correlation as current area SSB beam signal
In most strong PSS signal, and determine the location of most strong PSS signal, You Qiang in two PSS sequences difference locations
The location of PSS signal determines PSS time-domain signal present position pss_ in the received filtered data Data in current area
location；SSS time-domain signal and its present position sss_ are determined according to PSS time-domain signal present position pss_location
Location=pss_location+2* (L+CP).
6. method as claimed in claim 5, which is characterized in that S103 is specifically included:
S1031, the PSS time domain in filtered data is extracted from the PSS time-domain signal present position pss_location received
Signal simultaneously carries out FFT time-frequency convert, obtains received PSS frequency-region signal；
S1032, the cell ID serial number for representing received PSS frequency-region signal and local current PSSCorresponding PSS when equal to 0
Frequency domain sequence carries out cyclic shift sliding correlation, seeks the position of maximum correlation peaks；
S1033, SSS time-domain signal is extracted from filtered data according to SSS time-domain signal present position sss_location, and
Be FFT and obtain SSS frequency-region signal, by obtained SSS frequency-region signal withIt is worth corresponding local SSS frequency domain sequence phase one by one
It closes, seeks the SSS call number in maximum related value source, obtain group ID serial number representated by SSS sequenceIt finally acquires current
Optimal coverage cell
7. method as claimed in claim 5, which is characterized in that before S103, the method also includes:
It calculates and receives carrier wave frequency deviation present in data, and carrier wave frequency deviation described in compensation data is received, obtain compensation carrier frequency
Data to the rear；
The filtered data in the S1031 and S1033 is the data compensated after carrier wave frequency deviation.
8. the method for claim 7, which is characterized in that the calculating receives carrier wave frequency deviation present in data, and right
Carrier wave frequency deviation described in compensation data is received, the data after obtaining compensation carrier wave frequency deviation specifically:
According to previous PSS sequence PSS_FRONT and latter PSS sequence PSS_BACK, carried out using time domain phase deviation method
Nonlinear Transformation in Frequency Offset Estimation obtains carrier deviation value CFO, and the filtered data Data received is compensated using CFO, obtains compensation carrier wave
Data Data_new after frequency deviation；
Alternatively,
Using the previous PSS sequence PSS_FRONT and present position pss_ of the participation sliding related operation determined in S1015
Front_position and latter PSS sequence PSS_BACK and present position pss_back_position, and existed by SSB
The time domain repetition period property of 10ms, seeks multiple carrier deviation value CFO, and ask in N number of 10ms wireless frame period in radio frames
The average value for taking CFO compensates the filtered data Data received using the average value of CFO, after obtaining compensation carrier wave frequency deviation
Data Data_new；
Alternatively,
Using SSS time-domain signal fixed in S1021 and its present position, carrier wave frequency deviation is carried out using time domain phase deviation method
Estimation obtains carrier deviation value CFO, and the filtered data Data received is compensated using CFO, after obtaining compensation carrier wave frequency deviation
Data Data_new；
Alternatively,
Using SSS time-domain signal fixed in S1021 and its present position, and by the time domain weight of SSB 10ms in radio frames
It is multiple periodical, multiple carrier deviation value CFO are sought in N number of 10ms wireless frame period, and seek the average value of CFO, using CFO
Average value compensate the filtered data Data that receives, the data Data_new after obtaining compensation carrier wave frequency deviation；
Alternatively,
Using the previous PSS sequence PSS_FRONT and present position pss_ of the participation sliding related operation determined in S1015
Front_position and latter PSS sequence PSS_BACK and present position pss_back_position, and existed by SSB
The time domain repetition period property of 10ms in radio frames, seeks multiple carrier deviation value CFO in N number of 10ms wireless frame period；Using
Fixed SSS time-domain signal and its present position in S1021, and by the time domain repetition period property of SSB 10ms in radio frames,
Multiple carrier deviation value CFO are sought in N number of 10ms wireless frame period；And the average value of all CFO is sought, using the flat of CFO
Mean value compensates the filtered data Data received, the data Data_new after obtaining compensation carrier wave frequency deviation.
9. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists
In the computer program realizes search Physical Cell Identifier as claimed in any one of claims 1 to 8 when being executed by processor
Method the step of.
10. a kind of small base station, comprising:
One or more processors；
Memory；And
One or more computer programs, the processor and the memory are connected by bus, wherein one or more
A computer program is stored in the memory, and is configured to be executed by one or more of processors, special
Sign is that the processor realizes that search physics as claimed in any one of claims 1 to 8 is small when executing the computer program
The step of method of area's mark.
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