CN104735750B - A kind of small region search method and terminal - Google Patents
A kind of small region search method and terminal Download PDFInfo
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- CN104735750B CN104735750B CN201310713491.XA CN201310713491A CN104735750B CN 104735750 B CN104735750 B CN 104735750B CN 201310713491 A CN201310713491 A CN 201310713491A CN 104735750 B CN104735750 B CN 104735750B
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Abstract
The present invention relates to a kind of small region search method and terminals, terminal can be made to complete cell searching as early as possible under strong signal environment；Under weak signal environment, increases and receive correlation peak merging gain in data, improve cell searching performance.This method includes：S1, since first frequency point of N number of frequency point after sequence, receive the n of the frequency point0Cell detection is carried out after a data, until cell searching is successful or has detected N number of frequency point, when having detected N number of frequency point but failed cell searching, executes S2；N is the integer greater than 1, n0For the integer greater than 0, n0For the number of the data of reception frequency point under preset strong signal environment, strong signal environment refers to that signal-to-noise ratio is greater than the environment of default signal-noise ratio threshold；S2, essentially identical with S1, difference is the number for the PSS data that will receive frequency point by n0It is adjusted to n1, n1For the number of the data of reception frequency point under preset weak signal environment, n1For greater than n0Integer.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of small region search method and terminal.
Background technique
Terminal will communicate, and first have to be switched on.But terminal, in rigid booting, terminal is not adhered in any cell
, that is to say, that it is the information of no any cell in terminal at this time, so terminal needs first to carry out cell searching, according to
The cell information searched realizes the Frequency Synchronization and Timing Synchronization of terminal, and obtains cell ID（Identity, identity
Number）.Cell searching is generally divided into two steps：Frequency point scanning and cell detection.The function of frequency point frequency sweep is to find out to deposit
Realize that the Frequency Synchronization of terminal and cell and time are same by successively carrying out cell detection to these frequency points in the frequency point of cell
Step.
In LTE（Long Term Evolution, long term evolution）In system, pass through PSS（Primary
Synchronization Signal, primary synchronization signal）And SSS（Secondary synchronization signal, it is auxiliary same
Walk signal）To realize cell searching, TD-LTE（Time Division Long Term Evolution, timesharing long term evolution）
The time-frequency location of PSS signal and SSS signal is as shown in Figure 1 in system.By the available 10ms frame timing of PSS signal, obtain
nid（Network Identity, Network ID）2；By the available 5ms frame timing of SSS signal, nid1 is obtained；Pass through
The available cell ID of the value of nid2 and nid1（Identity, identity number）.
Small region search method in the prior art as shown in Fig. 2, the method comprising the steps of 201, step 202 and step 203,
These three steps are successively to carry out full frequency band or the sequence of part frequency point, PSS detection and SSS&CP（Cyclic Prefix, circulation
Prefix）Detection.Wherein step 201 be by estimating each frequency point power to full frequency band or part frequency point spectrum scan, according to
Each frequency point power sorts to whole frequency points or part frequency point, finds out most possible N number of frequency point；Step 202 passes through to a
5ms receives data and carries out PSS correlation blob detection, PSS timing and nid2 is obtained, particularly, under weak letter environment, due to PSS phase
It is poor to close peak, so the PSS relevant peaks to a 5ms is needed to detect again after merging, guarantees the detection of PSS under weak letter environment
Energy；Step 203 carries out SSS correlation blob detection by receiving data to b 5ms, obtains 5ms frame timing and nid1, likewise,
Since SSS relevant peaks are poor under weak letter environment, it is also desirable to be detected again after being merged to the SSS relevant peaks of b 5ms.Complete PSS inspection
It surveys after being detected with SSS, so that it may the Timing Synchronization and Frequency Synchronization of terminal and base station are realized according to the search result of cell, and
The detection of cell ID, so far, cell searching terminates.Then terminal enters the cell resident stage, and in this stage, terminal is according to institute
ID and the timing for detecting cell, receive the PBCH of detected cell ID again（Physical Broadcast Channel, physics
Broadcast channel）PBCH demodulation coding is carried out after channel data, reads the MIB in PBCH channel（Master Information
Block, Master Information Block）Information, attempt resident.
In the small region search method of the prior art, the value of a and b of setting are all bigger.Because in actual weak letter ring
Under border, since the relevant peaks of PSS and SSS are poor, in order to guarantee the performance of cell searching under weak letter environment, biggish a and b is needed.
But under letter environment by force, since the relevant peaks of PSS and SSS are all fine, setting a and b, which is equal to 1, to be accurately detected
PSS and SSS.However, the prior art all uses the processing under weak signal environment under weak signal environment and under strong letter environment
The value of technology, i.e. a and b is all bigger, will lead in this way by force letter environment under the cell detection time it is long, computationally intensive, function
Consumption is big.Simultaneously in actual scene, weak letter scene is fewer, so it is unreasonable for directlying adopt the detection scheme under weak letter.
In addition, being to be ranked up according to the power of each frequency point, when downlink reception data power is big in frequency point sequence
When there is uplink interference in synchronization signal power and TDD-LTE system, power is much larger than center frequency point at non-central frequency point
Power so that in frequency point ranking results correct frequency point may come frequency point list finally, such terminal needs are detecting
Correct frequency point can be just detected after many invalid frequency points, in addition, each invalid frequency point detection time is longer, considerably increased
The time of the scene cell searching and power consumption.
Summary of the invention
The purpose of the present invention is to provide a kind of small region search method and terminals, and small region search method can be divided into strong letter
Two kinds of situations of search merge less number in cell searching under strong signal environment under number environment and under weak signal environment
Data are received, enable the terminals to complete to search for and exit cell searching process as soon as possible；Under weak signal environment, in cell searching
When merge the reception data of more number, increase and receive correlation peak in data and merge gain, improve cell under weak letter environment
Search performance, to realize the function that cell searching adaptively exits.
In order to solve the above technical problems, embodiments of the present invention provide a kind of small region search method, including following step
Suddenly：
S1, since first frequency point of N number of frequency point after sequence, receive the n of the frequency point0Cell is carried out after a data
Detection, until cell searching success or detected N number of frequency point, when detected N number of frequency point but cell searching not yet at
When function, S2 is then executed；Wherein, the N is the integer greater than 1, the n0To receive the frequency under preset strong signal environment
The number of the data of point, the n0For the integer greater than 0, the strong signal environment refers to that signal-to-noise ratio is greater than default signal-noise ratio threshold
Environment；
S2, since first frequency point of N number of frequency point, receive the n of the frequency point1Cell inspection is carried out after a data
It surveys, until cell searching success or detected N number of frequency point, when detect N number of frequency point but cell searching not yet succeeds
When, determine cell searching failure；Wherein, the n1For received under preset weak signal environment the frequency point data number,
The n1For greater than the n0Integer, the weak signal environment refers to that signal-to-noise ratio is less than or equal to the default signal-noise ratio threshold
Environment.
Embodiments of the present invention also provide a kind of terminal, comprise the following modules：
First detection module, for receiving the n of the frequency point since first frequency point of N number of frequency point after sequence0It is a
Cell detection is carried out after data, until cell searching success or detected N number of frequency point, when detected N number of frequency point but
When cell searching is not yet successful, the second detection module is turned next to；Wherein, the N is the integer greater than 1, the n0It is default
Strong signal environment under receive the frequency point data number, the n0For the integer greater than 0, the strong signal environment refers to letter
It makes an uproar than the environment for being greater than default signal-noise ratio threshold；
Second detection module, for the first detection module detected N number of frequency point but cell searching not yet at
When function, since first frequency point of N number of frequency point, the n of the frequency point is received1Cell detection is carried out after a data, until
Cell searching success has detected N number of frequency point, when having detected N number of frequency point but cell searching is not yet successful, determines
Cell searching failure；Wherein, the n1For received under preset weak signal environment the frequency point data number, the n1For
Greater than the n0Integer, the weak signal environment refer to signal-to-noise ratio be less than or equal to the default signal-noise ratio threshold environment.
Embodiment of the present invention in terms of existing technologies, small region search method can be divided under strong signal environment and
Two kinds of situations are searched under weak signal environment to merge the data of less number in cell searching under strong signal environment, make terminal
It can complete to search for and exit cell searching process as soon as possible；Under weak signal environment, more number is merged in cell searching
Data, increase in data correlation peak and merge gain, cell searching performance under weak letter environment is improved, to realize that cell is searched
The function that rope adaptively exits.
Preferably, after cell searching success, the method also includes：It is read in the result of the cell detection
Take the Master Information Block MIB of cell.
As a further improvement of the present invention, terminal directly utilizes PSS detection and SSS detection in the result of cell detection
Data carry out MIB confirmation, rather than after the data for obtaining PSS detection and SSS detection, terminal is further according to the PSS received
The data of detection and SSS detection receive the data of PBCH channel again, then carry out MIB confirmation again.The present invention does not increase not only
The length of data is received in adjunction, but also can prevent the generation of spurious cell in cell search process.
Preferably, the cell detection includes：Primary synchronization signal PSS detection, secondary synchronization signal SSS and cyclic prefix CP inspection
It surveys.The PSS is detected：Respectively by each of described T data PSS data and the local PSS according to agreement generation
Sequence carries out related calculation, and obtains T PSS correlation result, and the T is equal to the n0Or the n1；It is related to the T PSS
Operation result does the instruction RSSI normalization of received signal intensity, obtains T PSS normalization correlated results；By the T PSS
Normalization correlated results makes decisions after merging, and obtains the PSS testing result, the PSS testing result includes the reception
Whether PSS relevant peaks are detected in data.Before the S2, when the T is equal to the n0When, extract the described of each frequency point
Maximum PSS normalization correlated results normalizes related function as the maximum of each frequency point in T normalization correlated results
Rate resequences to N number of frequency point according to the maximum normalization related power of each frequency point；In the S2,
Since first frequency point in N number of frequency point after the rearrangement, the n of the frequency point is received1It is carried out after a data
Cell detection is up to cell searching success or has detected N number of frequency point.The SSS detection and CP detection include：According to described
PSS detection as a result, interception it is described receive data in SSS data, by the T SSS data with according to agreement generation sheet
Ground SSS sequence carries out related calculation, and obtains T SSS correlation result, and the T is equal to the n0Or the n1；To the T
SSS correlation result does RSSI normalization, obtains T SSS normalization correlated results；By the T normalization correlated results
It is made decisions after merging, obtains the testing result of the SSS and CP detection, the testing result that the SSS and CP are detected includes institute
It states and receives in data whether detect SSS relevant peaks.
As a further improvement of the present invention, the maximum PSS of each frequency point obtained according to cell detection normalizes related
As a result it resequences to N number of frequency point, then carries out cell searching further according to N number of frequency point after rearrangement, can will have dry
The frequency point disturbed comes behind N number of frequency point queue, and frequency point sorts under downlink data or uplink interference scene when reducing high-power
Insecure cell searching used time.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the synchronization signal in TD-LTE system in the prior art；
Fig. 2 is small region search method flow diagram in the prior art；
Fig. 3 is the small region search method flow diagram that first embodiment of the invention provides；
Fig. 4 is the method flow schematic diagram that PSS is detected in first embodiment of the invention；
Fig. 5 is the method flow schematic diagram that SSS is detected in first embodiment of the invention；
Fig. 6 is the small region search method flow diagram that second embodiment of the invention provides；
Fig. 7 is the small region search method flow diagram that third embodiment of the invention provides；
Fig. 8 is the small region search method flow diagram that four embodiment of the invention provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and base
In the various changes and modifications of following embodiment, each claim of the application technical side claimed also may be implemented
Case.
First embodiment of the invention provides a kind of small region search method, in the method, first assumes that terminal is in strong letter
Number environment carries out cell searching using the small region search method under strong signal environment and just recognizes when terminal can not search cell
It is in weak signal environment for terminal, the small region search method under weak signal environment is recycled to carry out cell searching.Strong signal ring
Border refers to that signal-to-noise ratio is greater than the environment of default signal-noise ratio threshold, and weak signal environment refers to that signal-to-noise ratio is less than or equal to default signal-noise ratio threshold
Environment.Signal-noise ratio threshold is an adjustable threshold value being manually set, and exemplary, default signal-noise ratio threshold can be
10dB（Decibel, decibel）, therefore, the Environment Definition that can will be greater than 10dB is strong signal environment, will be less than or equal to 10dB
Environment Definition be weak signal environment.
Specifically, as shown in figure 3, this approach includes the following steps：
301, spectrum scan is carried out to full frequency band or part frequency point, the power of each frequency point is estimated, according to each frequency point function
Rate is ranked up whole frequency points or part frequency point, and finding out power is the strong N number of frequency point of preceding N.
N is the integer greater than 1.It should be noted that being scanned to the frequency spectrum of full frequency band or being carried out to part frequency point
Spectrum scan is that terminal according to scene carries out selection.The specific embodiment of step 301 is the prior art, and the present invention is herein not
It repeats.
302, since first frequency point of N number of frequency point after sequence, the n of frequency point is received0Cell inspection is carried out after a data
It surveys.n0For the number of the data of reception frequency point under preset strong signal environment, n0For the integer greater than 0.
Receive includes PSS data, SSS data and CP data in data.
Under letter environment by force, the relevant peaks of PSS and SSS are all fine, and therefore, it is smaller for can be set and receive the number of data
Value n0, PSS relevant peaks and SSS relevant peaks can be accurately detected by less reception data.It is exemplary, n0It can be with
It is 1.
Generally, receiving data is 5ms（Millisecond）Subframe.
Cell detection includes：PSS detection, SSS and CP detection.
Further, as shown in figure 4, PSS detection includes following sub-step：
Sub-step 3021, respectively by n0A local PSS for receiving each of data PSS data and being generated according to agreement
Sequence carries out related calculation, and obtains n0A PSS correlation result.
Related operation is a kind of mathematical operation in the prior art, and this will not be repeated here by the present invention.
Sub-step 3022, to n0A PSS correlation result does RSSI normalization, obtains n0A PSS normalization is related to tie
Fruit.
A kind of Mathematical treatment means in the prior art are normalized to, this will not be repeated here by the present invention.
Sub-step 3023, by n0A PSS normalization correlated results makes decisions after merging, and obtains PSS testing result, PSS
Testing result includes receiving in data whether detect PSS relevant peaks.
It should be noted that then being carried out when being detected in the subframe of 5ms in PSS testing result includes PSS relevant peaks
SSS and CP detection.In addition, should also include the PSS relevant peaks in the 5ms in the PSS testing result in addition to PSS relevant peaks
Specific location in subframe, since in 5ms subframe, the positional relationship of PSS and SSS are fixed, but difference CP type position
Relationship is different, therefore, can determine the position of SSS, according to the position where PSS relevant peaks in order to according to determining SSS
Position intercept SSS data, then carry out SSS and CP according to SSS data and detect.
Further, as shown in figure 5, SSS and CP detection includes following sub-step：
Sub-step 3024, according to PSS detection as a result, interception receive data in SSS data, by n0A SSS data with
It is carried out related calculation according to the local SSS sequence that agreement generates, obtains n0A SSS correlation result.
Sub-step 3025, to n0A SSS correlation result does RSSI normalization, obtains n0A SSS normalization is related to tie
Fruit.
Sub-step 3026, by n0A normalization correlated results makes decisions after merging, and obtains the detection knot of SSS and CP detection
The testing result of fruit, SSS and CP detection includes receiving in data whether detect SSS relevant peaks.
It should be noted that SSS and CP detection method process and PSS detection method process be substantially, only
One the difference is that, the result detected is different, SSS and CP detection be in order to detect receive data in whether have
SSS relevant peaks, and PSS detection is to detect whether there are PSS relevant peaks in 5ms sub-frame data.PSS relevant peaks and SSS phase
Guan Fengzhong carries Frequency Synchronization message and time synchronization message, terminal according to the Frequency Synchronization message and time synchronization message with
Cell in network synchronizes.
Step 302 leaves it at that.
303, judge whether cell searching succeeds.
PSS relevant peaks and SSS relevant peaks are detected simultaneously by the subframe of 5ms during the cell detection of step 302
When, determine cell searching success, terminate cell searching process, otherwise, executes step 304.
304, judge whether N number of frequency point has all detected.
When cell searching is failed and N number of frequency point has not been detected all, return step 302 continues cell inspection
It surveys；When having detected N number of frequency point but cell searching is not yet successful, step 305 is then executed, i.e., PSS is being carried out to N number of frequency point
After detection, SSS and CP detection, when PSS relevant peaks and SSS relevant peaks are not detected, it is believed that the terminal is in weak signal ring
Under border, cell searching is then carried out using the small region search method under weak environment.
305, since first frequency point of N number of frequency point after sequence, the n of frequency point is received1Cell is carried out after a PSS data
Detection.n1For the number of the data of reception frequency point under preset weak signal environment, n1For greater than n0Integer.
The embodiment of the step is identical as step 302, and referring specifically to the associated description of step 302, the present invention is herein not
It repeats.
It should be noted that this step is the small region search method under weak signal environment, and due under weak signal environment, PSS
Relevant peaks and SSS relevant peaks are poor, therefore, in order to guarantee the performance of cell searching, the PSS data of each frequency point of reception of setting
Number is greater than the number of the data for the received each frequency point being arranged in step 302.
306, judge whether cell searching succeeds.
The step is identical as step 303, i.e., detects simultaneously in the subframe of 5ms during the cell detection of step 305
When to PSS relevant peaks and SSS relevant peaks, determine cell searching success, terminate cell searching process, otherwise, executes step 307.
307, judge whether N number of frequency point has all detected.
The step and step 304 are essentially identical, but slightly different, and specific explanations are as follows：
When cell searching is failed and N number of frequency point has not been detected all, return step 305 continues cell inspection
It surveys；When having detected N number of frequency point but cell searching is not yet successful, determines cell searching failure, i.e., N number of frequency point is being carried out
After PSS detection, SSS and CP detection, when PSS relevant peaks and SSS relevant peaks are not detected, step 308 is executed.
308, determine cell searching failure.
After determining cell searching failure, terminate cell searching process.
Embodiment of the present invention in terms of existing technologies, small region search method can be divided under strong signal environment and
Two kinds of situations are searched under weak signal environment to merge the reception data of less number in cell searching under strong signal environment, make
Terminal can be completed to search for and exit cell searching process as soon as possible；Under weak signal environment, merge in cell searching more
The reception data of number increase correlation peak and merge gain, cell searching performance under weak letter environment improved, to realize cell
Search for the function of adaptively exiting.
Second embodiment of the present invention is related to a kind of small region search method.Second embodiment is in first embodiment base
It is further improved on plinth, mainly thes improvement is that：In second embodiment of the invention, after cell searching success,
This method further includes：The MIB of cell is read in the result of cell detection.As a further improvement of the present invention, terminal is direct
Using in the result of cell detection PSS detection and SSS detection data carry out MIB confirmation, rather than obtain PSS detection and
After the data of SSS detection, terminal receives PBCH channel further according to the data of the PSS detection and SSS detection that receive again
Then data carry out MIB confirmation again.The present invention not only receives the length of data without increasing, but also can prevent cell from searching
The generation of spurious cell during rope, spurious cell refer to being not detected to come in real network and what terminal detected
This cell.
As shown in fig. 6, present embodiment specifically includes step 601 to step 610, wherein step 601 to step 608 with
Step 301 in first embodiment is identical to step 308, compared with first embodiment, newly-increased step 609 and step
It rapid 610 specific implementation method and is described as follows：
Step 609, the MIB for reading cell.
After detecting PSS relevant peaks and SSS relevant peaks by step 601 to step 608, that is, obtaining frame synchronization letter
After breath, step 609 reads PBCH (Physical Broadcast Channel, physical broadcast first from frame synchronization information
Channel) message, then reads MIB from PBCH message again.
Step 610 judges whether the MIB of cell successfully reads.
If the MIB of cell is read successfully, terminate cell search process；If the MIB of cell is read not successfully, directly tie
Beam cell search process.
Terminal directly carries out MIB confirmation using the data of PSS detection and SSS detection in the result of cell detection, rather than
After the data for obtaining PSS detection and SSS detection, terminal is detected with the data of SSS detection again further according to the PSS received
The data for receiving PBCH channel carry out the confirmation of MIB, can prevent the generation of spurious cell.
It is not difficult to find that present embodiment is system embodiment corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
Third embodiment of the present invention is related to a kind of small region search method.Third embodiment is in second embodiment base
It is further improved on plinth, mainly thes improvement is that：In second embodiment of the invention, when using under strong signal environment
Small region search method has searched for N number of frequency point, but when cell searching is failed, resequences to N number of frequency point, specially basis
The maximum PSS normalization related power for each frequency point that cell detection obtains resequences to N number of frequency point, can will have in this way
The frequency point of interference comes behind N number of frequency point queue, and frequency point is arranged under downlink data or uplink interference scene when reducing high-power
Sequence insecure cell searching used time.
As shown in fig. 7, present embodiment specifically includes step 701 to step 711, wherein step 701 to step 704 is divided
Not and the step 601 in second embodiment is identical as step 604 correspondence, step 706 to step 711 respectively with the second embodiment party
Step 605 in formula is identical to step 610 correspondence, and the step increased newly in present embodiment is step 705, newly-increased step 705
Specific implementation method and be described as follows：
Step 705, before step 706, extract the n of each frequency point0Maximum PSS normalizing in a normalization correlated results
Change maximum normalization related power of the correlated results as each frequency point, according to the maximum normalization related power pair of each frequency point
N number of frequency point rearrangement.
It should be noted that after to the rearrangement of N number of frequency point, using the small region search method under weak signal environment,
In step 706, since first frequency point in N number of frequency point after rearrangement, the n of frequency point is received1A PSS data are laggard
Row cell detection is up to cell searching success or has detected N number of frequency point.
Can will have noisy frequency point in this way to come behind N number of frequency point queue, downlink data when reducing high-power
Or frequency point sorts insecure cell searching used time under uplink interference scene.
It is not difficult to find that present embodiment is system embodiment corresponding with second embodiment, present embodiment can be with
Second embodiment is worked in coordination implementation.The relevant technical details mentioned in second embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
4th embodiment of the invention is related to a kind of small region search method.4th embodiment is in first embodiment base
This is identical, as shown in figure 8, present embodiment includes step 801 to step 808, wherein 802 and step 805 it is real with first respectively
The step 302 and step 305 difference in mode are applied, present embodiment is different from the first embodiment place and is：This embodiment party
In formula, cell detecting method used in step 802 and step 805 can be the method for progress cell detection in the prior art,
It step 802 and step 805 specific implementation method and is described as follows：
Step 802 receives n2A data directly carry out PSS correlation blob detection, receive n3A data directly carry out SSS correlation
Blob detection.
The step is compared with the step 302 in first embodiment, does not need to carry out related operation and normalization
Processing, but directly detected using received data.
Step 805, to receive data in n2A PSS data carry out PSS correlation blob detection after merging；To in reception data
N3A SSS data carry out SSS correlation blob detection after merging.
Wherein, n2And n3It is to compare n0Big integer.
Since PSS relevant peaks under weak signal environment and SSS relevant peaks are poor, so needing respectively to n2The reception number of a 5ms
According to and n3The SSS data of a 5ms merge, to guarantee the detection performance of PSS and SSS under weak letter environment.
Fifth embodiment of the invention is related to a kind of terminal, comprises the following modules：
First detection module, for receiving the n of frequency point since first frequency point of N number of frequency point after sequence0A data
After carry out cell detection, until cell searching success or detected N number of frequency point, when having detected N number of frequency point but cell searching not yet
When success, the second detection module is turned next to；Wherein, N is the integer greater than 1, n0To receive frequency under preset strong signal environment
The number of the data of point, n0For the integer greater than 0, strong signal environment refers to that signal-to-noise ratio is greater than the environment of default signal-noise ratio threshold.
Second detection module, for the first detection module detected N number of frequency point but cell searching not yet at
When function, since first frequency point of N number of frequency point, the n of frequency point is received1Cell detection is carried out after a data, until cell searching
Success has detected N number of frequency point, when having detected N number of frequency point but cell searching is not yet successful, determines cell searching failure；Its
In, n1For the number of the data of reception frequency point under preset weak signal environment, n1For greater than n0Integer, weak signal environment refers to letter
It makes an uproar than the environment for being less than or equal to default signal-noise ratio threshold.
First detection module and the second detection module include：
PSS detection sub-module, secondary synchronization signal SSS and cyclic prefix CP detection sub-module.
PSS detection sub-module includes following subelement：
Related operation subelement, for receiving each of data PSS data and according to agreement generation for T respectively
Local PSS sequence carries out related calculation, and obtains T PSS correlation result, and T is equal to n0Or n1。
Subelement is normalized, for doing RSSI normalization to T PSS correlation result, obtains T PSS normalization phase
Close result.
Subelement is adjudicated, is made decisions for normalizing T PSS after correlated results merges, obtains PSS testing result,
PSS testing result includes receiving in data whether detect PSS relevant peaks.
SSS and CP detection sub-module includes following subelement：
Related operation subelement, for according to PSS detect as a result, interception receive data in SSS data, by T SSS
Data carry out related calculation with the local SSS sequence generated according to agreement, obtain T SSS correlation result, and T is equal to n0Or n1。
Subelement is normalized, for doing RSSI normalization to T SSS correlation result, obtains T SSS normalization phase
Close result.
Subelement is adjudicated, for making decisions after merging T normalization correlated results, obtains the inspection of SSS and CP detection
Survey as a result, the testing result of SSS and CP detection includes receiving in data whether detect SSS relevant peaks.
In terms of existing technologies, terminal includes first detection module and the second detection module to embodiment of the present invention,
First detection module can be used in the cell searching under strong signal environment, and the second detection module can be used under weak signal environment
Cell searching merges the reception data of less number in cell searching, enables the terminals to as soon as possible in first detection module
It completes to search for and exits cell searching process；In the second detection module, the reception number of more number is merged in cell searching
According to, it increases and receives correlation peak merging gain in data, cell searching performance under the weak letter environment of raising, to realize that cell is searched
The function that rope adaptively exits.
Sixth embodiment of the invention is related to a kind of terminal, sixth embodiment done on the basis of five embodiments into
One step is improved, and is mainly theed improvement is that：The terminal, which increases, reads MIB module, and reading MIB module is used for for when first
When detection module or the second detection module are successfully searched cell, in the cell detection of first detection module or the second detection module
Result in read cell MIB.
As a further improvement of the present invention, the reading MIB module of terminal directly utilizes PSS in the result of cell detection to examine
It surveys and the data of SSS detection carries out MIB confirmation, rather than after the data for obtaining PSS detection and SSS detection, terminal root again
The data for receiving PBCH channel again according to the data of the PSS detection and SSS detection that receive, then carry out MIB confirmation again.This hair
The bright length that data are not only received without increasing, but also the generation of spurious cell in cell search process can be prevented.
Seventh embodiment of the invention is related to a kind of terminal, the 7th embodiment done on the basis of sixth embodiment into
One step is improved, and is mainly theed improvement is that：The terminal is increased again with lower module：
It resequences module, maximum PSS normalizes correlation in the T normalization correlated results for extracting each frequency point
As a result as the maximum normalization related power of each frequency point, according to the maximum normalization related power of each frequency point to N number of frequency
Point rearrangement, T are equal to n0。
After rearrangement module is resequenced, the second detection module is from N number of frequency point after rearrangement
First frequency point starts, and receives the n of frequency point1Cell detection is carried out after a data up to cell searching success or has detected N number of frequency
Point.
As a further improvement of the present invention, the maximum for each frequency point that rearrangement module is obtained according to cell detection
PSS normalization correlated results resequences to N number of frequency point, can will have noisy frequency point and come behind N number of frequency point queue,
Frequency point sorts insecure cell searching used time under downlink data or uplink interference scene when reducing high-power.
Eighth embodiment of the invention is related to a kind of terminal, and the terminal is similar with the terminal that the 5th embodiment is related to,
The terminal includes first detection module and the second detection module, unlike, which is used for received n2It is a
PSS data directly carry out PSS correlation blob detection；To received n3A SSS data directly carry out SSS correlation blob detection.
The first detection module that first detection module is provided with the 5th embodiment is compared, the first inspection of the terminal
It surveys module not needing to carry out related operation and normalized when carrying out PSS detection and SSS is detected, but directly utilizes and receive
Data detected.
Second detection module is used for received n2A PSS data carry out PSS correlation blob detection after merging；To received
n3A SSS data carry out SSS correlation blob detection after merging.
Since PSS relevant peaks under weak signal environment and SSS relevant peaks are poor, so needing respectively to n2The PSS data of a 5ms
And n3The SSS data of a 5ms merge, to guarantee the detection performance of PSS and SSS under weak letter environment.
It is noted that being logic module about each module involved in the embodiment of device, in reality
In, a logic unit can be a physical unit, be also possible to a part of a physical unit, can also be with more
The combination of a physical unit is realized.The working principle of each physical unit can be with reference to the narration in embodiment of the method, the present invention
Details are not described herein.In addition, in order to protrude innovative part of the invention, it will not be with solution institute of the present invention in present embodiment
The technical issues of proposition, the less close unit of relationship introduced, but this does not indicate that there is no other single in present embodiment
Member.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (12)
1. a kind of small region search method, which is characterized in that include the following steps：
S1, since first frequency point of N number of frequency point after sequence, receive the n of the frequency point0Cell detection is carried out after a data,
Until cell searching is successful or has detected N number of frequency point, when having detected N number of frequency point but cell searching is not yet successful,
Then S2 is executed；Wherein, the N is the integer greater than 1, the n0For the number for receiving the frequency point under preset strong signal environment
According to number, the n0For the integer greater than 0, the strong signal environment refers to that signal-to-noise ratio is greater than the environment of default signal-noise ratio threshold；
S2, since first frequency point of N number of frequency point, receive the n of the frequency point1Cell detection is carried out after a data, until
Cell searching success has detected N number of frequency point, when having detected N number of frequency point but cell searching is not yet successful, determines
Cell searching failure；Wherein, the n1For received under preset weak signal environment the frequency point data number, the n1For
Greater than the n0Integer, the weak signal environment refer to signal-to-noise ratio be less than or equal to the default signal-noise ratio threshold environment.
2. small region search method according to claim 1, which is characterized in that described after cell searching success
Method further includes：
The Master Information Block MIB of cell is read in the result of the cell detection.
3. small region search method according to claim 1, which is characterized in that the cell detection includes：
Primary synchronization signal PSS detection, secondary synchronization signal SSS and cyclic prefix CP detection.
4. small region search method according to claim 3, which is characterized in that the PSS, which is detected, includes：
Each of T reception data PSS data are done into related fortune to the local PSS sequence generated according to agreement respectively
It calculates, obtains T PSS correlation result, the T is equal to the n0Or the n1；
The instruction RSSI normalization of received signal intensity is done to the T PSS correlation result, obtains T PSS normalization phase
Close result；
It is made decisions after T PSS normalization correlated results is merged, obtains the PSS testing result, the PSS detection
It as a result include whether detecting PSS relevant peaks in the reception data.
5. small region search method according to claim 4, which is characterized in that before the S2, when the T is equal to described
n0When, it extracts maximum PSS in the T normalization correlated results of each frequency point and normalizes correlated results as described each
The maximum normalization related power of frequency point, according to the maximum normalization related power of each frequency point to N number of frequency
Point rearrangement；
In the S2, since first frequency point in N number of frequency point after the rearrangement, the frequency point is received
n1Cell detection is carried out after a data up to cell searching success or has detected N number of frequency point.
6. small region search method according to claim 3, which is characterized in that the SSS detection and CP detection include：
According to PSS detection as a result, the SSS data received in data are intercepted, by T SSS data and according to agreement
The local SSS sequence of generation carries out related calculation, and obtains T SSS correlation result, and the T is equal to the n0Or the n1；
RSSI normalization is done to the T SSS correlation result, obtains T SSS normalization correlated results；
It is made decisions after the T normalization correlated results is merged, obtains the testing result of the SSS and CP detection, it is described
The testing result of SSS and CP detection includes whether detecting SSS relevant peaks in the reception data.
7. a kind of terminal, which is characterized in that comprise the following modules：
First detection module, for receiving the n of the frequency point since first frequency point of N number of frequency point after sequence0A data
After carry out cell detection, until cell searching success or having detected N number of frequency point；Wherein, the N is the integer greater than 1, institute
State n0For received under preset strong signal environment the frequency point data number, the n0For the integer greater than 0, the strong letter
Number environment refers to that signal-to-noise ratio is greater than the environment of default signal-noise ratio threshold；
Second detection module, for the first detection module detect N number of frequency point but cell searching not yet succeed when,
Since first frequency point of N number of frequency point, the n of the frequency point is received1Cell detection is carried out after a data, until cell is searched
Suo Chenggong has detected N number of frequency point, when having detected N number of frequency point but cell searching is not yet successful, determines that cell is searched
Rope failure；Wherein, the n1For received under preset weak signal environment the frequency point data number, the n1For greater than institute
State n0Integer, the weak signal environment refer to signal-to-noise ratio be less than or equal to the default signal-noise ratio threshold environment.
8. terminal according to claim 7, which is characterized in that the terminal further includes：
Read Master Information Block MIB module, for when the first detection module or second detection module be successfully searched it is small
Qu Shi reads the MIB of cell in the result of the cell detection of the first detection module or second detection module.
9. terminal according to claim 7, which is characterized in that the first detection module and second detection module are equal
Including：
PSS detection sub-module, secondary synchronization signal SSS and cyclic prefix CP detection sub-module.
10. terminal according to claim 9, which is characterized in that the PSS detection sub-module includes following subelement：
Related operation subelement, for what is generated respectively by each of T reception data PSS data and according to agreement
Local PSS sequence carries out related calculation, and obtains T PSS correlation result, and the T is equal to the n0Or the n1；
Subelement is normalized, for doing RSSI normalization to the T PSS correlation result, obtains T PSS normalization phase
Close result；
Subelement is adjudicated, for making decisions after merging T PSS normalization correlated results, obtains the PSS detection knot
Fruit, the PSS testing result include whether detecting PSS relevant peaks in the reception data.
11. terminal according to claim 10, which is characterized in that the terminal further includes：
It resequences module, maximum PSS normalizes correlation in the T normalization correlated results for extracting each frequency point
As a result related according to the maximum normalization of each frequency point as the maximum normalization related power of each frequency point
Power resequences to N number of frequency point, and the T is equal to the n0；
Second detection module is since first frequency point in N number of frequency point after the rearrangement, described in reception
The n of frequency point1Cell detection is carried out after a data up to cell searching success or has detected N number of frequency point.
12. terminal according to claim 9, which is characterized in that SSS the and CP detection sub-module includes that following son is single
Member：
Related operation subelement, for according to the PSS detect as a result, interception it is described receive data in SSS data, by T
A SSS data carry out related calculation with the local SSS sequence generated according to agreement, obtain T SSS correlation result, described T etc.
In the n0Or the n1；
Subelement is normalized, for doing RSSI normalization to the T SSS correlation result, obtains T SSS normalization phase
Close result；
Subelement is adjudicated, for making decisions after merging the T normalization correlated results, obtains the SSS and CP detection
Testing result, the SSS and CP detection testing result include whether detecting SSS relevant peaks in the reception data.
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| CN106332231B (en) * | 2015-06-29 | 2019-12-03 | 展讯通信（上海）有限公司 | Mobile terminal small region search method and device |
| CN106817188B (en) * | 2015-11-30 | 2018-06-05 | 北京展讯高科通信技术有限公司 | The detection method of user terminal and its adjacent cell |
| CN109474359B (en) * | 2017-09-08 | 2020-10-20 | 电信科学技术研究院 | Frequency sweeping method, terminal equipment and storage medium |
| CN112235219B (en) * | 2020-10-14 | 2023-02-10 | 紫光展锐(重庆)科技有限公司 | Timing synchronization detection method and device |
| CN112566077B (en) * | 2020-11-30 | 2023-03-24 | 紫光展锐(重庆)科技有限公司 | Cell search method, system, electronic device and readable storage medium |
| CN113411159B (en) * | 2021-06-22 | 2023-01-20 | Oppo广东移动通信有限公司 | Frequency searching method, device and storage medium |
| CN114727368B (en) * | 2022-06-10 | 2022-08-30 | 北京智联安科技有限公司 | Rapid frequency sweeping method, device and medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388723A (en) * | 2008-10-28 | 2009-03-18 | 重庆重邮信科通信技术有限公司 | Radio communication timing synchronization method, cell searching method and system |
| CN101834657A (en) * | 2010-04-01 | 2010-09-15 | 复旦大学 | 3GPP (3rd Generation Partnership Project) LET (Long Term Evolution) downlink initial master synchronization detection method |
| CN102223696A (en) * | 2011-06-17 | 2011-10-19 | 电子科技大学 | Cell searching method in LTE (long term evolution) system |
| CN102271384A (en) * | 2010-09-30 | 2011-12-07 | 重庆重邮信科通信技术有限公司 | Primary cell searching method for long term evolution (LTE) system |
| 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 |
-
2013
- 2013-12-20 CN CN201310713491.XA patent/CN104735750B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388723A (en) * | 2008-10-28 | 2009-03-18 | 重庆重邮信科通信技术有限公司 | Radio communication timing synchronization method, cell searching method and system |
| CN101834657A (en) * | 2010-04-01 | 2010-09-15 | 复旦大学 | 3GPP (3rd Generation Partnership Project) LET (Long Term Evolution) downlink initial master synchronization detection method |
| CN102271384A (en) * | 2010-09-30 | 2011-12-07 | 重庆重邮信科通信技术有限公司 | Primary cell searching method for long term evolution (LTE) system |
| CN102223696A (en) * | 2011-06-17 | 2011-10-19 | 电子科技大学 | Cell searching method in LTE (long term evolution) system |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于LTE系统的小区初搜方法;颜帅;《电信快报》;20121231(第2期);正文第1-2节，图2、3 * |
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