CN103856974B - The method and apparatus of cell measurement in communication terminal and long evolving system - Google Patents
The method and apparatus of cell measurement in communication terminal and long evolving system Download PDFInfo
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Abstract
The method and apparatus of cell measurement in a kind of communication terminal and long evolving system, methods described includes：Carry out the first time-frequency conversion respectively to the symbol with cell specific reference signal CRS and obtain the first frequency domain data, therefrom choose threeth frequency domain data of the cell to be measured on CRS positions and CRS therein is descrambled to obtain channel estimation results；The correspondence position that channel estimation results are put back in the first frequency domain data, the frequency domain data zero setting of other positions generates the 4th frequency domain data and carries out frequency-time domain transformation to it and obtain channel impulse response；Time domain data in channel impulse response is compared with predetermined threshold value, the time domain data clearing less than predetermined threshold value；Second time-frequency conversion is carried out to the channel impulse response after processing and obtains the second frequency domain data, fiveth frequency domain data of the cell to be measured on CRS positions is therefrom chosen, CRS therein is calculated and obtains Reference Signal Received Power.The technical program can effectively reduce influence of the noise jamming to cell measurement precision.
Description
Technical field
The present invention relates to communication technical field, cell measurement in more particularly to a kind of communication terminal and long evolving system
Method and apparatus.
Background technology
The development of mobile communication adds data service transition, and data service from initial speech business to speech business
Obvious acceleration mode is showed, increasing user adds 3G (Third Generation) Moblie now（3G）Grid.In order to more
Good mobile data experience, the transmittability of 3G systems has gradually showed deficiency, then the long evolving system of 3G systems
（LTE, Long Term Evolution）Arise at the historic moment.LTE is improved and is enhanced 3G aerial access technology, using orthogonal frequency
Divide multiplexing（OFDM, OrthogonalFrequency Division Multiplexing）Technology and multiple-input, multiple-output（MIMO,
Multiple-InputMultiple-Output）Technology is used as the sole criterion of its wireless network evolution, design highest downlink speed
Rate 100Mbps, upstream rate 50Mbps.LTE technologies will greatly promote experience of the user to mobile communication business, be operator's band
Come more technologies and cost advantage.Meanwhile, the leading position of legacy cellular mobile technology has also been consolidated in the appearance of LTE technologies.
In mobile radio system, user equipment（UE, User Equipment）Seamless Mobile be principal character.
The states of UE in a network are broadly divided into idle condition and connection status, therefore UE mobile management is broadly divided under idle condition
Mobile management and connection status under mobile management.Movement under idle condition is mainly to be realized by cell reselection, by
UE is independently carried out；Movement under connection status is mainly realized by cell switching, by network side（eNodeB）Control is carried out.
Because the foundation that cell reselection and cell switch is exactly UE to serving cell and the measurement result of adjacent cell, therefore measurement result pair
It is most important in the Seamless Mobile for realizing UE.
UE measurement implementation method is not specified by LTE agreement, specify only what measurement to be reached in LTE agreement
Required precision.And in the cell measuring method of some existing LTE systems, generally all may be because there is noise jamming to measurement
Precision produce influence.
Correlation technique reference may also be made to Publication No. EP2381715A1 european patent application, the patent application disclose one
Plant resource measurement and report method in long evolving system.
The content of the invention
The problem to be solved in the present invention is that the cell measurement in existing long evolving system may be because having noise jamming
And influence the precision of measurement.
To solve the above problems, the method that technical solution of the present invention provides cell measurement in a kind of long evolving system, bag
Include：
First time-frequency conversion is carried out respectively to the symbol with cell specific reference signal CRS；
Of cell to be measured on CRS positions is chosen from the first frequency domain data obtained after first time-frequency conversion
Three frequency domain datas；
CRS in 3rd frequency domain data is descrambled, estimated with obtaining channel of each subcarrier on CRS positions
Count result；
The correspondence position that the channel estimation results are put back in first frequency domain data, and by the frequency domain of other positions
Data zero setting, to generate the 4th frequency domain data；
Frequency-time domain transformation is carried out to the 4th frequency domain data, the channel impulse response of time domain is obtained；
Denoising is carried out to the channel impulse response, the denoising includes：By in the channel impulse response
All time domain datas be compared with predetermined threshold value, less than the predetermined threshold value time domain data clearing；
Second time-frequency conversion is carried out to the channel impulse response after the denoising；
Of cell to be measured on CRS positions is chosen from the second frequency domain data obtained after second time-frequency conversion
Five frequency domain datas；
Power is asked to the CRS in the 5th frequency domain data and is averaged, to obtain the reference of the cell to be measured
Signal reception power value.
Optionally, threeth frequency domain data or fiveth frequency domain data of the cell to be measured on CRS positions are chosen and is based on cell
Information realization, the cell information at least includes cell ID, frame timing and the cyclic prefix mode of cell to be measured.
Optionally, the cell information also includes the subframe sequence number of cell to be measured, in the 3rd frequency domain data
CRS is descrambled subframe sequence number and cell ID based on cell to be measured and realized.
Optionally, the predetermined threshold value is obtained according to emulation or test case.
Optionally, the predetermined threshold value is the maximum diameter power obtained by the channel impulse response of the time domain with passing through
Emulation or the ratio of the predetermined parameter alpha of test case, wherein α>1, α increases with the increase of the bandwidth of system.
Optionally, the span of the predetermined threshold value is the maximum diameter obtained by the channel impulse response of the time domain
Power reduces 0dB to 18dB.
Optionally, first time-frequency conversion and the second time-frequency conversion are Fourier transformation, and the frequency-time domain transformation is Fu
In leaf inverse transformation.
To solve the above problems, technical solution of the present invention also provides a kind of device of cell measurement in long evolving system,
Including：
First time-frequency conversion unit, suitable for carrying out the first time-frequency change respectively to the symbol with cell specific reference signal CRS
Change；
First chooses unit, suitable for choosing to be measured small from the first frequency domain data obtained after first time-frequency conversion
Threeth frequency domain data of the area on CRS positions；
Channel estimating unit, suitable for descrambling to the CRS in the 3rd frequency domain data, is existed with obtaining each subcarrier
Channel estimation results on CRS positions；
First processing units, suitable for the correspondence position for putting back to the channel estimation results in first frequency domain data,
And by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data；
Frequency-time domain transformation unit, suitable for carrying out frequency-time domain transformation to the 4th frequency domain data, the Channel Impulse for obtaining time domain rings
Should；
Second processing unit, suitable for carrying out denoising to the channel impulse response, the denoising includes：By institute
All time domain datas stated in channel impulse response are compared with predetermined threshold value, the time domain less than the predetermined threshold value
Zeros data；
Second time-frequency conversion unit, suitable for carrying out the second time-frequency conversion to the channel impulse response after the denoising；
Second chooses unit, suitable for choosing to be measured small from the second frequency domain data obtained after second time-frequency conversion
Fiveth frequency domain data of the area on CRS positions；
Power calculation unit, it is described to obtain suitable for seeking power to the CRS in the 5th frequency domain data and being averaged
The Reference Signal Received Power value of cell to be measured.
To solve the above problems, technical solution of the present invention also provides a kind of including cell measurement in above-mentioned long evolving system
Device communication terminal.
Compared with prior art, technical solution of the present invention at least has advantages below：
By channel estimation results of each subcarrier based on cell to be measured on CRS positions, the first time-frequency is become
The first frequency domain data obtained after changing is handled to generate the 4th frequency domain data, then enters line frequency to the 4th frequency domain data
The channel impulse response obtained after Shi Bianhuan carries out denoising, so as to effectively reduce noise jamming to cell measurement precision
Influence；The second frequency domain is obtained after subsequently carrying out the second time-frequency conversion again with the channel impulse response after the denoising
Data, therefrom choose fiveth frequency domain data of the cell to be measured on CRS positions, the CRS in the 5th frequency domain data are asked
The Reference Signal Received Power value of the cell to be measured is obtained after power and progress averagely, carrying for cell measurement precision is realized
It is high.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for cell measurement in the long evolving system that embodiment of the present invention is provided；
Fig. 2 is the position view of the symbol with CRS in the next resource block of conventional cyclic prefix；
Fig. 3 is the position view of the symbol with CRS in the next resource block of extended cyclic prefix；
Fig. 4 be embodiment of the present invention long evolving system in cell measurement device structural representation.
Embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.Detail is elaborated in the following description to fully understand the present invention.But
It is that the present invention can be implemented with a variety of different from other manner described here, those skilled in the art can be without prejudice to originally
Similar popularization is done in the case of invention intension.Therefore the present invention is not limited by following public embodiment.
According to third generation partner program（3GPP, 3rd Generation Partnership Project）
The description of TS36.214 specifications is understood, in LTE system, and three are had in measurement：1）Reference Signal Received Power（RSRP,
Reference Signal Receiving Power）, its definition is cell specific reference signal in Measurement bandwidth（CRS,
Cell-specific Reference Signal）The linear averaging of power；2）Carrier received signal intensity is indicated（RSSI,
Received Signal Strength Indication）, it is the symbol power that reference signal is carried in Measurement bandwidth that it, which is defined,
Linear averaging, include the interference of desired signal, cochannel, the power of adjacent-channel interference and thermal noise；3）Reference signal is received
Quality（RSRQ, ReferenceSignal Receiving Quality）, its definition is that NxRSRP/RSSI, RSRP and RSSI are shown in
Above-mentioned definition, N is resource block in Measurement bandwidth（RB, Resource Block）Number.Two values of wherein RSRP and RSRQ will
Report, RSRP indicates the absolute power of the reference signal received, RSRQ indicates reference signal power with receiving general power
Relative ratio.In addition, according to related protocol, the bandwidth of LTE system sets and has 1.4,3,5,10,15, six kinds of feelings of 20MHz
Condition, minimum bandwidth is 1.4MHz.The selection of Measurement bandwidth depends on UE disposal ability, from 1.4MHz bandwidth to the cell configuration
System bandwidth.
From RSRP and RSSI definition, UE measurement is mainly to the symbol progress with CRS in descending sub frame.
Specifically, the RSSI that survey calculation includes is calculated, RSRP is calculated and RSRQ is calculated, respectively such as following formula：
In formula（1）In, R (k, l) is the band CRS received data of the symbol in frequency domain, and L is the symbol with CRS
Number, N is the number of RB in the bandwidth measured, and k and l represent symbol sequence number and subcarrier sequence number with CRS respectively.Conversion
For being expressed as follows for dBm：
Wherein, dB_rfGain represents rf gain.
RSRP is converted into being expressed as follows after dBm：
Formula（3）Middle RSRP is similar to RSSI, is to calculate obtained CRS receiving powers.
RSRQ is expressed as follows with dB：
dB_RSRQ=10*log 10(N)+dBm_RSRP-dBm_RSSI （4）
, typically all may be because there is noise jamming to measurement in the cell measuring method of some existing LTE systems
Precision produces influence, so as to be difficult to stabilization, realize cell measurement exactly.
There is provided a kind of side of cell measurement in long evolving system according to the characteristics of LTE system for embodiment of the present invention
Method, the signal under being configured to different bandwidth is measured, and can effectively reduce influence of the noise jamming to cell measurement precision,
And protocol requirement precision is disclosure satisfy that, with preferable stability and versatility.
Fig. 1 is the schematic flow sheet of the method for cell measurement in the long evolving system that embodiment of the present invention is provided.Please
Refering to Fig. 1, the method for cell measurement includes in the long evolving system：
Step S1, the first time-frequency conversion is carried out to the symbol with cell specific reference signal CRS respectively；
Step S2, chooses cell to be measured at CRS from the first frequency domain data obtained after first time-frequency conversion
The 3rd frequency domain data put；
Step S3, descrambles to the CRS in the 3rd frequency domain data, to obtain each subcarrier on CRS positions
Channel estimation results；
Step S4, the correspondence position that the channel estimation results are put back in first frequency domain data, and by other positions
The frequency domain data zero setting put, to generate the 4th frequency domain data；
Step S5, carries out frequency-time domain transformation to the 4th frequency domain data, obtains the channel impulse response of time domain；
Step S6, denoising is carried out to the channel impulse response, and the denoising includes：By the Channel Impulse
All time domain datas in response are compared with predetermined threshold value, the time domain data clearing less than the predetermined threshold value；
Step S7, the second time-frequency conversion is carried out to the channel impulse response after the denoising；
Step S8, chooses cell to be measured at CRS from the second frequency domain data obtained after second time-frequency conversion
The 5th frequency domain data put；
Step S9, seeks power to the CRS in the 5th frequency domain data and is averaged, to obtain the cell to be measured
Reference Signal Received Power value.
In embodiment of the present invention, cell measurement includes serving cell measurement, co-frequency neighbor cell measurement and iso-frequency adjacent community
At least one of measurement.In general, carry out generally also including before cell measurement：Cell synchronous and/or adjacent cell search.
Cell synchronous is that information updating is synchronized to currently resident serving cell, and adjacent cell search is to unknown adjacent cell progress
Search, may search for co-frequency neighbor cell, can also search for iso-frequency adjacent community.In the specific embodiment of the invention, cell synchronous and
The purpose of adjacent cell search is provided to obtain the cell ID of cell to be measured, frame timing（Or be frame synchronization）And cyclic prefix
The cell information such as type, so as to be measured to the cell.Actual when implementing, the type and measuring sequence of cell measurement can be with
Flexible configuration as needed.Survey calculation process of the embodiment of the present invention only to being carried out in cell measurement using OFDM symbol
It is described in detail, and the process dawn known to those skilled in the art of cell synchronous and adjacent cell search, therefore it is no longer detailed
Description.
The method of cell measurement in above-mentioned long evolving system is elaborated with specific embodiment below.
It should be noted that the present embodiment provide long evolving system in cell measurement method, can be used not only for not
In the case of knowing bandwidth of cell and antenna in cell configuration, to being measured in 1.4MHz bandwidth, known cell bandwidth can be used for
Afterwards, to being measured more than signal in 1.4MHz bandwidth.Especially in the case where knowing bandwidth of cell and antenna in cell configuration,
To being measured more than signal in 1.4MHz bandwidth, it can more effectively reduce shadow of the noise jamming to cell measurement precision
Ring, improve measurement accuracy.
In the case of bandwidth of cell and antenna in cell configuration is not known by, it can be surveyed by being realized in system minimum bandwidth
Amount, specifically, only can be measured on frequency domain to the subcarrier in the center 1.08MHz bandwidth of system.Such benefit
It is：After cell searching, it is not necessary to read and resolution system information from CBCH, it is possible to realize small to each
Area is measured, and thus, it is possible to simplify measurement control, shortens the time delay that measurement is reported.
According to cyclic prefix（CP, Cyclic Prefix）Length it is different, the symbol quantity that a subframe is included is not yet
Together, when using conventional cyclic prefix（Normal CP）When, subframe includes 14 symbols, when using extended cyclic prefix
（Extended CP）When, a subframe includes 12 symbols.The cell measurement of long evolving system is mainly in descending sub frame pair
Symbol with CRS is carried out, under different cyclic prefix modes, and the position of the symbol with CRS is not in a resource block
Together.According to related protocol, under conventional cyclic prefix and under extended cyclic prefix, the position of the symbol with CRS in a resource block
Respectively as shown in Figures 2 and 3, horizontal direction is represented in time domain, Fig. 2, under conventional cyclic prefix, and a resource block has 14 in time domain
In individual OFDM symbol, symbol serial number 0 ~ 13, Fig. 3, under extended cyclic prefix, a resource block has 12 OFDM symbols in time domain
Number, symbol serial number 0 ~ 11；Vertical direction represents in frequency domain, Fig. 2 and Fig. 3 that a resource block has 12 subcarriers on frequency domain,
Subcarrier serial number 0 ~ 11.Under conventional cyclic prefix, the symbol with CRS is as Fig. 2 bends are filled in a resource block
Shown in grid, the serial number { 0,4,7,11 } of sub- four symbol with CRS of frame in, under extended cyclic prefix, a money
The symbol with CRS is as shown in the grid that Fig. 3 bends are filled in source block, the sequence number of sub- four symbol with CRS of frame in
For { 0,3,6,9 }.
Make r (k, i) represent four symbols with CRS of a frame in, k=0,1,2,3, be symbolic number of the frame in CRS；i=
0,1 ..., N-1, i be bandwidth of cell under OFDM symbol sampled point, N be total sampled point number.
Step S1 is performed, the first time-frequency conversion is carried out respectively to the symbol with cell specific reference signal CRS.The present embodiment
In, first time-frequency conversion is Fourier transformation, specifically, can be by four symbol r (k, i) with CRS of a frame in respectively
Carry out N point discrete Fast Fourier Transform iterative inversions（FFT, Fast FourierTransform）, so as to realize the change from time domain to frequency domain
Change, i.e.,：
R (k, i)=FFT [r (k, i)], wherein R (k, i) represent the first frequency domain data obtained after FFT.
After step S1, step S2 is performed, chooses and treats from the first frequency domain data obtained after first time-frequency conversion
Measure threeth frequency domain data of the cell on CRS positions.
In the present embodiment, it is to be based on cell that threeth frequency domain data of the cell to be measured on CRS positions is chosen in step S2
Information realization, the cell information at least includes cell ID, frame timing and the cyclic prefix mode of cell to be measured.This implementation
" cell information " described in example can be by directly obtaining in cell synchronous and/or adjacent cell search procedure, can also base
Calculate and obtain in the information of acquisition.
Step S2 is the process screened to reference signal, specifically, according to the cell ID of cell to be measured, frame timing
And cyclic prefix mode, cell to be measured is selected in CRS from the first frequency domain data R (k, i) obtained after FFT
The 3rd frequency domain data on position, obtains R_crs (k, j)；Wherein, j is i subset, represents band in the 3rd frequency domain data
There are the CRS corresponding subcarrier sequence number of symbol, j=0,1,2 ..., J-1, wherein J are that a symbol is carried in Measurement bandwidth
CRS frequency domain data total number.
After step S2, step S3 is performed, the CRS in the 3rd frequency domain data is descrambled, to obtain each height
Channel estimation results of the carrier wave on CRS positions.
In the present embodiment, the cell information also includes in the subframe sequence number of cell to be measured, step S3 to the described 3rd
It is that subframe sequence number and cell ID based on cell to be measured are realized that CRS in frequency domain data R_crs (k, j), which carries out descrambling,.
Step S3 is the process descrambled to reference signal, specifically, and CRS is carried out according to subframe sequence number and cell ID
Descrambling, H_crs (k, j) is expressed as by the result obtained after descrambling.Channel estimation is actually carried out due to being descrambled to CRS
Process, accordingly it is also possible to which H_crs (k, j) is referred to as into channel estimation results.
After step S3, step S4 is performed, the channel estimation results are put back in the first frequency domain data R (k, i)
Correspondence position, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data R ' (k, i).Pass through step S4's
The channel estimation results for reflecting current channel conditions, can be updated by processing to the first frequency domain data R (k, i), will
The frequency domain data zero setting of other positions can then eliminate the interference of noise to a certain extent.In the present embodiment, step will be passed through
Frequency domain data after S4 processing is referred to as the 4th frequency domain data R ' (k, i).
After step S4, step S5 is performed, frequency-time domain transformation is carried out to the 4th frequency domain data R ' (k, i), time domain is obtained
Channel impulse response h (k, i).In the present embodiment, frequency-time domain transformation described in step S5 is inverse Fourier transform（IFT,
Inverse Fourier Transform）, can also be specifically inverse fast Fourier transform（IFFT, Inverse Fast
Fourier Transform）, for realizing conversion of the 4th frequency domain data R ' (k, i) from frequency domain to time domain, so that subsequently
Step can make further denoising in time domain to channel impulse response h (k, i).
After step S5, step S6 is performed, the channel impulse response h (k, i) is carried out at denoising, the denoising
Reason includes：All time domain datas in the channel impulse response h (k, i) are compared with predetermined threshold value, less than institute
The time domain data for stating predetermined threshold value is reset.
In order to more precisely calculate the Reference Signal Received Power of cell to be measured, the present embodiment is made by step S6
Further noise reduction process.Specifically, in time domain by the data of each sample point（Time domain number in i.e. described channel impulse response
According to）With predetermined threshold value（Or be noise reduction threshold value）Compare, the time domain data more than or equal to threshold value is considered effective road
The data of footpath transmission, the time domain data less than threshold value is considered that noise or interference are zeroed out.
In the present embodiment, the predetermined threshold value can be obtained according to emulation or test case.When it is implemented, described pre-
Gating limit value can be by the channel impulse response h (k, i) of the time domain maximum diameter power obtained and by emulation or test case
The ratio of predetermined parameter alpha, i.e.,：
Predetermined threshold value=maximum diameter power/α；Wherein α>1, α increases with the increase of system bandwidth.
When the bandwidth of system is bigger, the channel that the cell measuring method provided by the present embodiment is calculated is more accurate, can
The footpath of resolution is also more accurate, therefore, in the case where knowing bandwidth of cell and antenna in cell configuration, to more than 1.4MHz bandwidth
Interior signal is measured, and influence of the noise jamming to cell measurement precision can be more effectively reduced by step S6, is improved
Measurement accuracy.
It should be noted that the determination for the predetermined threshold value is not limited to the " maximum diameter of the present embodiment offer
The mode of the ratio of power and α ", in other embodiments, can also take more thorough mode, for example can be according to maximum
Footpath power and mean power carry out comprehensive assessment.
When actually implementing, the span of the predetermined threshold value can be the channel impulse response h (k, i) by time domain
The maximum diameter power of acquisition reduces 0dB to 18dB.For example, the predetermined threshold value being set as to, maximum diameter power is reduced
6dB, in addition to the time domain data of maximum diameter, is considered that noise jamming is carried out clear by the time domain data less than maximum diameter power 6dB
Zero.
After step S6, step S7 is performed, when carrying out second to the channel impulse response h ' (k, i) after the denoising
Frequency is converted.
It should be noted that the second time-frequency conversion described in step S7 and the first time-frequency conversion class described in step S1
Seemingly, otherwise varied is the object difference for carrying out time-frequency conversion, and the first time-frequency conversion is carried out to the symbol r (k, i) with CRS, the
Two time-frequency conversions are carried out to the channel impulse response h ' (k, i) after denoising.When it is implemented, second time-frequency conversion can
Think Fourier transformation, can also be Fast Fourier Transform (FFT), so as to realize the conversion from time domain to frequency domain, i.e.,：
R " (k, i)=FFT [h ' (k, i)], wherein R " (k, i) represent the second frequency domain data obtained after FFT.
After step S7, perform in step S8, the second frequency domain data R " (k, i) obtained after second time-frequency conversion
Choose fiveth frequency domain data R_crs ' (k, j) of the cell to be measured on CRS positions.
It should be noted that fiveth frequency domain data R_ of the selection cell to be measured on CRS positions described in step S8
Threeth frequency domain data R_crs (k, j) of the selection cell to be measured on CRS positions described in crs ' (k, j) and step S2 it
Between mode of operation it is similar, otherwise varied is that the object chosen is different, and step S2 chooses from the first frequency domain data R (k, i),
The 3rd frequency domain data R_crs (k, j) is obtained, and step S8 chooses from the second frequency domain data R " (k, i), obtains the 5th frequency domain number
According to R_crs ' (k, j).
After step S8, step S9 is performed, asks power to go forward side by side the CRS in the 5th frequency domain data R_crs ' (k, j)
Row is average, to obtain the Reference Signal Received Power value of the cell to be measured.
Because couple CRS determined seeks power and is averaged to obtain the Reference Signal Received Power value of cell to be measured
Specific implementation dawn known to those skilled in the art, it is not described in detail herein.It is pointed out that being carried out in step S9
Operation（Seek power and be averaged to calculate RSRP）Object be different from prior art because would generally be directly to the 3rd frequency domain
CRS in data R_crs (k, j) is operated, and is that the CRS in the 5th frequency domain data R_crs ' (k, j) is entered in step S9
Row operation, because the 5th frequency domain data R_crs ' (k, j) is by above-mentioned correlation step progress noise reduction process, therefore obtain
The Reference Signal Received Power value of cell to be measured can be more accurate, i.e. cell measurement precision is improved.
Corresponding to the method for cell measurement in above-mentioned long evolving system, embodiment of the present invention also provides one kind and drilled for a long time
Enter the device of cell measurement in system.Fig. 4 be embodiment of the present invention long evolving system in cell measurement device knot
Structure schematic diagram.As shown in figure 4, the device of cell measurement includes in the long evolving system：First time-frequency conversion unit 1, is fitted
In carrying out the first time-frequency conversion respectively to the symbol with cell specific reference signal CRS；First chooses unit 2, suitable for from described
Threeth frequency domain data of the cell to be measured on CRS positions is chosen in the first frequency domain data obtained after first time-frequency conversion；Letter
Road estimation unit 3, suitable for descrambling to the CRS in the 3rd frequency domain data, to obtain each subcarrier on CRS positions
Channel estimation results；First processing units 4, suitable for pair for putting back to the channel estimation results in first frequency domain data
Position is answered, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data；Frequency-time domain transformation unit 5, suitable for described
4th frequency domain data carries out frequency-time domain transformation, obtains the channel impulse response of time domain；Second processing unit 6, suitable for the channel
Shock response carries out denoising, and the denoising includes：By all time domain datas in the channel impulse response and in advance
Gating limit value is compared, the time domain data clearing less than the predetermined threshold value；Second time-frequency conversion unit 7, suitable for pair
Channel impulse response after the denoising carries out the second time-frequency conversion；Second chooses unit 8, suitable for from second time-frequency
Fiveth frequency domain data of the cell to be measured on CRS positions is chosen in the second frequency domain data obtained after conversion；Power calculation list
Member 9, suitable for seeking power to the CRS in the 5th frequency domain data and being averaged, to obtain the reference of the cell to be measured
Signal reception power value.
In one embodiment, first time-frequency conversion and the second time-frequency conversion are Fourier transformation, the frequency
When be transformed to inverse Fourier transform, the span of the predetermined threshold value is to be obtained by the channel impulse response of the time domain
Maximum diameter power reduces 0dB to 18dB.
When it is implemented, it is described first selection unit 2 choose first frequency domain data of the cell to be measured on CRS positions with
And the second selection unit 8 chooses second frequency domain data of the cell to be measured on CRS positions and is based on cell information realization,
The cell information at least includes cell ID, frame timing and the cyclic prefix mode of cell to be measured.In addition, the cell information
The CRS also included in the subframe sequence number of cell to be measured, 3 pairs of channel estimating unit the 3rd frequency domain data descrambles
Subframe sequence number and cell ID based on cell to be measured are realized.
Actually implement when, it is described first selection unit 2 and second choose unit 8 can be integrated in a selection unit it
In, the first time-frequency conversion unit 1 and the second time-frequency conversion unit 7 can be integrated among a time-frequency converter unit.
In addition, embodiment of the present invention additionally provide it is a kind of including the device of cell measurement in above-mentioned long evolving system
Communication terminal.During actual implementation, the communication terminal is specifically as follows mobile phone, the flat board for supporting that communication is realized under LTE system
Computer etc..
The specific implementation of the device of cell measurement in the communication terminal and long evolving system, is referred to above-mentioned long-term
The implementation of the method for cell measurement in evolution system, here is omitted.
It will be understood by those skilled in the art that realizing in above-described embodiment cell in communication terminal and long evolving system
The all or part of the device of measurement can be by program to instruct the hardware of correlation to complete, and described program can be stored
In computer-readable recording medium, the storage medium can be ROM, RAM, magnetic disc, CD etc..
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair
Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention
Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (11)
1. a kind of method of cell measurement in long evolving system, it is characterised in that including：
First time-frequency conversion is carried out respectively to the symbol with CRS, CRS represents cell specific reference signal；
Threeth frequency of the cell to be measured on CRS positions is chosen from the first frequency domain data obtained after first time-frequency conversion
Numeric field data；
CRS in 3rd frequency domain data is descrambled, to obtain channel estimation knot of each subcarrier on CRS positions
Really；
The correspondence position that the channel estimation results are put back in first frequency domain data, and by the frequency domain data of other positions
Zero setting, to generate the 4th frequency domain data；
Frequency-time domain transformation is carried out to the 4th frequency domain data, the channel impulse response of time domain is obtained；
Denoising is carried out to the channel impulse response, the denoising includes：By the institute in the channel impulse response
There is time domain data to be compared with predetermined threshold value, the time domain data clearing less than the predetermined threshold value；
Second time-frequency conversion is carried out to the channel impulse response after the denoising；
Fiveth frequency of the cell to be measured on CRS positions is chosen from the second frequency domain data obtained after second time-frequency conversion
Numeric field data；
Power is asked to the CRS in the 5th frequency domain data and is averaged, to obtain the reference signal of the cell to be measured
Received power value；
Wherein, threeth frequency domain data or fiveth frequency domain data of the cell to be measured on CRS positions are chosen and is based on cell information reality
Existing, the cell information at least includes cell ID, frame timing and the cyclic prefix mode of cell to be measured.
2. the method for cell measurement in long evolving system according to claim 1, it is characterised in that the cell information
Also include the subframe sequence number of cell to be measured, the CRS in the 3rd frequency domain data is descrambled based on cell to be measured
Subframe sequence number and cell ID are realized.
3. the method for cell measurement in long evolving system according to claim 1, it is characterised in that the pre-determined threshold
Value is obtained according to emulation or test case.
4. the method for cell measurement in long evolving system according to claim 3, it is characterised in that the pre-determined threshold
The maximum diameter power for being worth to be obtained by the channel impulse response of the time domain is with passing through emulation or the predetermined ginseng of test case
Number α ratio, wherein α>1, α increases with the increase of system bandwidth.
5. the method for cell measurement in long evolving system according to claim 1, it is characterised in that the pre-determined threshold
The span of value is that the maximum diameter power obtained by the channel impulse response of the time domain reduces 0dB to 18dB.
6. the method for cell measurement in long evolving system according to claim 1, it is characterised in that first time-frequency
Conversion and the second time-frequency conversion are Fourier transformation, and the frequency-time domain transformation is inverse Fourier transform.
7. the device of cell measurement in a kind of long evolving system, it is characterised in that including：
First time-frequency conversion unit, suitable for carrying out the first time-frequency conversion respectively to the symbol with cell specific reference signal CRS,
CRS represents cell specific reference signal；
First chooses unit, exists suitable for choosing cell to be measured from the first frequency domain data obtained after first time-frequency conversion
The 3rd frequency domain data on CRS positions；
Channel estimating unit, suitable for descrambling to the CRS in the 3rd frequency domain data, to obtain each subcarrier in CRS
Channel estimation results on position；
First processing units, suitable for the correspondence position for putting back to the channel estimation results in first frequency domain data, and will
The frequency domain data zero setting of other positions, to generate the 4th frequency domain data；
Frequency-time domain transformation unit, suitable for carrying out frequency-time domain transformation to the 4th frequency domain data, obtains the channel impulse response of time domain；
Second processing unit, suitable for carrying out denoising to the channel impulse response, the denoising includes：By the letter
All time domain datas in road shock response are compared with predetermined threshold value, the time domain data less than the predetermined threshold value
Reset；
Second time-frequency conversion unit, suitable for carrying out the second time-frequency conversion to the channel impulse response after the denoising；
Second chooses unit, exists suitable for choosing cell to be measured from the second frequency domain data obtained after second time-frequency conversion
The 5th frequency domain data on CRS positions；
Power calculation unit, it is described to be measured to obtain suitable for seeking power to the CRS in the 5th frequency domain data and being averaged
Measure the Reference Signal Received Power value of cell；
Wherein, described first first frequency domain data and described second of the unit selection cell to be measured on CRS positions are chosen
Choose second frequency domain data of the unit selection cell to be measured on CRS positions and be based on cell information realization, the cell letter
Breath at least includes cell ID, frame timing and the cyclic prefix mode of cell to be measured.
8. the device of cell measurement in long evolving system according to claim 7, it is characterised in that the cell information
Also include the subframe sequence number of cell to be measured, the channel estimating unit descrambles to the CRS in the 3rd frequency domain data
Subframe sequence number and cell ID based on cell to be measured are realized.
9. the device of cell measurement in long evolving system according to claim 7, it is characterised in that the pre-determined threshold
The span of value is that the maximum diameter power obtained by the channel impulse response of the time domain reduces 0dB to 18dB.
10. the device of cell measurement in long evolving system according to claim 7, it is characterised in that when described first
Frequency is converted and the second time-frequency conversion is Fourier transformation, and the frequency-time domain transformation is inverse Fourier transform.
11. a kind of communication terminal, it is characterised in that including small in the long evolving system described in any one of claim 7 to 10
The device of region measurement.
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| CN109314616B (en) * | 2016-06-01 | 2021-04-20 | 华为技术有限公司 | Channel estimation method, related device and system |
| CN116056221B (en) * | 2022-12-06 | 2024-03-22 | 深圳市极客空间科技有限公司 | Method and system for improving frequency domain resource allocation to realize application of LTE (Long term evolution) in Internet of things |
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