CN106533820B - The method, apparatus and user equipment of cell measurement - Google Patents
The method, apparatus and user equipment of cell measurement Download PDFInfo
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Abstract
A kind of method, apparatus and user equipment of cell measurement, which comprises Fourier transformation is carried out to the time domain baseband signals received and obtains frequency-region signal；Channel estimation is carried out to the reference signal in the frequency-region signal and obtains the channel estimation value and noise estimation value of the frequency domain reference signal subcarrier point；Time offset estimation is carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol, obtains time offset estimation value；Partial compensation for the time is carried out according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point；The performance number of the channel estimation value of the reference signal subcarrier point after seeking the partial compensation for the time and the average value for taking the performance number；The average value is subtracted into the difference that the noise estimation value obtains, the Reference Signal Received Power value as the cell to be measured.Can be promoted using the above scheme measurement result it is anti-when partially with the performance of frequency deviation, and improve robustness.
Description
Technical field
The present invention relates to the method, apparatus and user equipment of field of communication technology more particularly to a kind of cell measurement.
Background technique
The development of mobile communication adds data service transition, and data service from initial voice service to voice service
Apparent acceleration mode is showed, 3G (Third Generation) Moblie (3G) grid is added in present more and more users.In order to more
Good mobile data experience, the transmittability of 3G system have gradually showed deficiency, then the long evolving system of 3G system
(Long Term Evolution, LTE) comes into being.LTE is improved and is enhanced the aerial access technology of 3G, using orthogonal frequency
Divide multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology and multiple-input, multiple-output
(Multiple-Input Multiple-Output, the MIMO) sole criterion of technology as its wireless network evolution, design is most
High downstream rate 100Mbps, upstream rate 50Mbps.LTE technology will greatly promote experience of the user to mobile communication business, be
Operator brings more technologies and cost advantage.Meanwhile the master of legacy cellular mobile technology has also been consolidated in the appearance of LTE technology
Lead status.
In mobile radio system, the Seamless Mobile of user equipment (User Equipment, UE) is main feature.
The state of UE in a network is divided into idle state and connection status, therefore the mobile management of UE is broadly divided into the shifting under idle state
Mobile management under dynamic management and connection status.Movement under idle state is mainly to be realized by cell reselection, certainly by UE
Main progress；Movement under connection status is mainly realized by cell switching, is controlled and is carried out by network side (eNodeB).Due to
Cell reselection and the foundation of cell switching are exactly measurement result of the UE to serving cell and adjacent cell, therefore measurement result is for reality
The Seamless Mobile of existing UE is most important.
Currently, inclined or frequency deviation when the measurement method of cell is provided by other modules other than measuring device for measurement result
Information.
But this cell measuring method may cause measurement result it is anti-when partially with the reduced performance of frequency deviation, and reduce
Robustness.
Summary of the invention
Problems solved by the invention be promoted measurement result it is anti-when partially with the performance of frequency deviation, and improve robustness.
To solve the above problems, the present invention provides a kind of method of cell measurement, which comprises
Fourier transformation is carried out to the time domain baseband signals received and obtains frequency-region signal；
Channel estimation is carried out to the reference signal in the frequency-region signal and obtains the frequency domain reference signal subcarrier point
Channel estimation value and noise estimation value；
Time offset estimation is carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol,
Obtain time offset estimation value；
Partial compensation for the time is carried out according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point；
The performance number of the channel estimation value of the reference signal subcarrier point after seeking the partial compensation for the time simultaneously takes described
The average value of performance number；
The average value is subtracted into the difference that the noise estimation value obtains, the reference signal as the cell to be measured
Received power value.
Optionally, the method also includes:
The window's position of the Fourier transformation is adjusted according to the time offset estimation value.
Optionally, the method also includes:
Offset estimation is carried out using the channel estimation value of the reference signal subcarrier point of the same position of different OFDM symbols,
Offset estimation value is obtained, the channel estimation value is the channel estimation value of the reference signal subcarrier point after the partial compensation for the time；
Frequency deviation compensation is carried out to the time domain baseband signals received according to the offset estimation value.
Optionally, the offset estimation, comprising:
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the same position of the different OFDM symbols, obtain
To the first end value；
The offset estimation value is obtained according to the phase information of first end value.
Optionally, the offset estimation, comprising:
Wherein Δ f is offset estimation value, and Dt is the reference signal
At the interval of frequency domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l difference
Indicate symbol serial number and OFDM serial number with the reference signal, HpK, lFor the channel estimation of the reference signal subcarrier point
Value.
Optionally, the method also includes: the frequency deviation offset is filtered.
Optionally, the time offset estimation, comprising:
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as the second end value；
The time offset estimation value is obtained according to the phase information of second end value.
Optionally, the time offset estimation, comprising:
Wherein the Δ τ is offset estimation value, DfFor the reference
For signal at the interval of time domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l
Respectively indicate symbol serial number and OFDM serial number with the reference signal, HpK, lChannel for the reference signal subcarrier point is estimated
Evaluation.
Optionally, the value of the Df is 3 or 6.
Optionally, the method also includes: the time offset estimation value is filtered.
A kind of device of cell measurement, described device include:
Fourier transform unit obtains frequency-region signal suitable for carrying out Fourier transformation to the time domain baseband signals received；
Channel estimating unit obtains the frequency domain reference signal subcarrier suitable for carrying out channel estimation to the frequency-region signal
The channel estimation value and noise estimation value of point；
Time offset estimation unit, suitable for being estimated using the channel of the reference signal subcarrier point of adjacent position in same OFDM symbol
Evaluation carries out time offset estimation, obtains time offset estimation value；
Partial compensation for the time unit, suitable for being estimated according to channel of the time offset estimation value to the frequency domain reference signal subcarrier point
Evaluation carries out partial compensation for the time；
Computing unit, the performance number of the channel estimation value suitable for seeking the reference signal subcarrier point after the partial compensation for the time
And take the average value of the performance number, and the average value is subtracted into the difference that the noise estimation value obtains, as it is described to
Measure the Reference Signal Received Power value of cell.
Optionally, described device further include:
Adjustment unit, suitable for adjusting the window's position of the Fourier transformation according to the time offset estimation value.
Optionally, described device further include:
The channel of frequency deviation estimating unit, the reference signal subcarrier point suitable for the same position using different OFDM symbols is estimated
Evaluation carries out offset estimation, obtains offset estimation value；
Frequency offset compensation element, suitable for carrying out frequency deviation to the time domain baseband signals received according to the offset estimation value
Compensation.
Optionally, the frequency deviation estimating unit, suitable for the reference signal of the same position of the different OFDM symbols is sub
The channel estimation value conjugate multiplication of carrier wave point, obtains the first end value；
The offset estimation value is obtained according to the phase information of first end value.
Optionally, the frequency deviation estimating unit is suitable for obtaining the offset estimation value according to following formula:
Wherein Δ f is offset estimation value, and Dt is the reference signal
At the interval of frequency domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l difference
Indicate symbol serial number and OFDM serial number with the reference signal, HpK, lFor the channel estimation of the reference signal subcarrier point
Value.
Optionally, described device further include:
First filter unit, suitable for being filtered to the compensated frequency domain reference signal of the frequency deviation.
Optionally, the time offset estimation unit, suitable for estimating the channel of the reference signal subcarrier point of the adjacent position
Evaluation conjugate multiplication, as the second end value；
The time offset estimation value is obtained according to the phase information of second end value.
Optionally, the time offset estimation unit is suitable for obtaining the time offset estimation value according to following formula:
Wherein the Δ τ is offset estimation value, DfFor the reference
For signal at the interval of time domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l
Respectively indicate symbol serial number and OFDM serial number with the reference signal, HpK, lChannel for the reference signal subcarrier point is estimated
Evaluation.
Optionally, the value of Df described in described device is 3 or 6.
Optionally, described device further include: the second filter unit, suitable for the frequency domain reference signal after the partial compensation for the time
It is filtered.
A kind of user equipment, the user equipment include: the device of cell measurement described in any of the above item.
Compared with prior art, technical solution of the present invention has the advantage that
Time offset estimation is carried out by using the channel estimation value of the reference signal of adjacent position in same OFDM symbol, then
Partial compensation for the time is carried out according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point, due to using
Believe one side only breath when measuring device itself provides, so as to promoted measurement result it is anti-when inclined performance, and improve the robustness of measurement.
And offset estimation is carried out by using the channel estimation value of the reference signal of the same position of different OFDM symbols, it connects
Frequency deviation compensation is carried out to the time domain baseband signals that receive according to the offset estimation value, due to using measuring device sheet
Body provides frequency deviation information, so as to promote the performance of the anti-frequency deviation of measurement result, and improves the robustness of measurement.
Further, since frequency deviation compensation can be carried out to time-domain signal before time domain Fourier transformation, so as to small
Area switch when, when be supplied to serving cell with the information of frequency deviation partially, so as to the performance of lifting system.
Further, due in cell reselection, new serving cell can obtain immediately signal it is new when believe partially with frequency deviation
Breath, so as to improve throughput performance at this time.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for one of embodiment of the present invention cell measurement；
Fig. 2 is the flow diagram of the device of one of embodiment of the present invention cell measurement.
Specific embodiment
According to third generation partner program (3rd Generation Partnership Project, 3GPP)
The description of TS36.214 specification measures there are three contents: 1) Reference Signal Received Power (Reference it is found that in LTE system
Signal Receiving Power, RSRP), definition is cell specific reference signal (Cell-specific in Measurement bandwidth
Reference Signal, CRS) power linear averaging；2) carrier received signal intensity indicates (Received Signal
Strength Indication, RSSI), definition is the linear averaging of the symbol power in Measurement bandwidth with reference signal,
Power including desired signal, cochannel interference, adjacent-channel interference and thermal noise；3) Reference Signal Received Quality
(Reference Signal Receiving Quality, RSRQ), definition is on N × RSRP/RSSI, RSRP and RSSI are shown in
Definition is stated, N is the number of resource block in Measurement bandwidth (Resource Block, RB).Wherein RSRP and RSRQ two value will on
Report, RSRP indicate the absolute power of the reference signal received, and RSRQ indicates reference signal power and receives general power
Relative ratio.
By the definition of RSRP and RSSI it is found that the measurement of user equipment (User Equipment, UE) is mainly to downlink
What the symbol in subframe with CRS carried out.Specifically, the RSSI for including in survey calculation is calculated, RSRP is calculated and RSRQ is calculated,
Respectively such as following formula:
In formula (1), RK, lIt is the data of the symbol with CRS that receives in frequency domain, L is of the symbol with CRS
Number, N is the number of the RB in the bandwidth measured, and k and l respectively indicate symbol serial number and subcarrier serial number with CRS.
In formula (2), HK, lFor the channel impulse response of time domain, L is the number of the symbol with CRS, NcrsIt is of CRS
Number, k and l respectively indicate symbol serial number and subcarrier serial number with CRS.
In formula (3), N is the number of the RB in the bandwidth measured, and RSRP and RSSI are as defined above.
Currently, inclined or frequency deviation when the measurement method of cell is provided by other modules other than measuring device for measurement result
Information.But this cell measuring method may cause measurement result it is anti-when it is partially poor with the ability of frequency deviation, robustness is weak.
For problem described above, the embodiment of the invention provides the method, apparatus of cell measurement and user equipmenies, lead to
Cross and carry out time offset estimation using the channel estimation value of the reference signal of adjacent position in same OFDM symbol, then according to it is described when
Inclined estimated value carries out partial compensation for the time to the frequency domain reference signal.And the reference of the same position by using different OFDM symbols
The channel estimation value of signal carries out offset estimation, then according to the offset estimation value to the time domain reference signal received
Frequency deviation compensation is carried out, inclined and frequency deviation information when due to using measuring device itself to provide, so as to promote the anti-frequency of measurement result
Inclined performance, and improve the robustness of measurement.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Fig. 1 shows the flow diagram of the method for one of embodiment of the present invention cell measurement.Below in conjunction with Fig. 1 pairs
The specific implementation step of the measurement method describes in detail.
S11: Fourier transformation is carried out to the time domain baseband signals received and obtains frequency-region signal.
It in specific implementation, can be to the time domain base received due to the more convenient processing of the reference signal of frequency domain and modulation
Band signal carries out Fourier transformation and obtains frequency-region signal.
S12: channel estimation is carried out to the reference signal in the frequency-region signal and obtains the frequency domain reference signal subcarrier
The channel estimation value and noise estimation value of point.
In specific implementation, channel estimation can be carried out to the frequency-region signal and obtains the frequency domain reference signal subcarrier
The channel estimation value and noise estimation value of point, so as to know the configured transmission of transmission channel.
S13: inclined when being carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol
Estimation, obtains time offset estimation value.
In specific implementation, it since the subcarrier upper signal channel estimated value of adjacent position has the characteristics that close, can be used
The channel estimation value of the reference signal subcarrier point of adjacent position carries out time offset estimation in same OFDM symbol, obtains time offset estimation
Value.
It in an embodiment of the present invention, can be first by the channel estimation value of the reference signal subcarrier point of the adjacent position
Conjugate multiplication obtains the time offset estimation value then according to the phase information of second end value as the second end value.
In an embodiment of the present invention, formula (4) can be used and obtain the time offset estimation value:
Wherein, parameter, Δ τ is time offset estimation value, DfIt is the reference signal at the interval of time domain, L is the reference signal
Number, N is the number of the resource block in the bandwidth measured, and k and l respectively indicate the symbol serial number with the reference signal
With OFDM serial number, HpK, lFor the channel estimation value of the reference signal subcarrier point.
In an embodiment of the present invention, the DfValue be 3, in an alternative embodiment of the invention, the DfValue be
6。
In specific implementation, in order to enable according to the time offset estimation value to the letter of the frequency domain reference signal subcarrier point
The process that road estimated value carries out partial compensation for the time is more smooth, can be filtered to the time offset estimation value.
S14: inclined when being carried out according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point
Compensation.
It in specific implementation, can be according to the time offset estimation value in order to improve the accuracy of the signal in time
Partial compensation for the time is carried out to the channel estimation value of the frequency domain reference signal subcarrier point.
Moreover, in an embodiment of the present invention, in order to adjust the window's position that Fourier changes next time, to obtain
More accurate signal interception position can also adjust the window's position of the Fourier transformation according to the time offset estimation value.
In specific implementation, in order to promote the accuracy on the reference signal frequency, different OFDM symbols can be used
The channel estimation value of reference signal subcarrier point of same position carry out offset estimation, and according to the offset estimation value pair
The time domain baseband signals received carry out frequency deviation compensation.
In specific implementation, by the channel estimation of the reference signal subcarrier point of the same position of the different OFDM symbols
It is worth conjugate multiplication, obtains the first end value, obtains the offset estimation value then according to the phase information of first end value.
In an embodiment of the present invention, the offset estimation value can be obtained using formula (5):
Wherein, f is offset estimation value, and Dt is the reference signal at the interval of frequency domain, and L is of the reference signal
Number, N are the numbers of the resource block in the bandwidth measured, k and l respectively indicate the symbol serial number with the reference signal and
OFDM serial number, HpK, lFor the channel estimation value of the reference signal subcarrier point.
It is provided according to the agreement of LTE/LTEA, when the type of cyclic prefix is conventional cyclic prefix, offset estimation can be with
Estimated between symbol 0 and symbol 7, symbol 4 and symbol 11, can also in symbol 0 and symbol 4, symbol 7 and symbol 11 it
Between estimated, can also be symbol 0 and symbol 4, symbol 7 and symbol 11 are estimated between symbol 4 and symbol 7.Work as circulation
When the type of prefix is extended cyclic prefix, offset estimation can be in symbol 0 and symbol 3, symbol 3 and symbol 6, symbol 6 and symbol
Estimated between numbers 9.
In specific implementation, in order to enable frequency deviation process is more smooth, the offset estimation value can also be filtered.
S15: the performance number of the channel estimation value of the reference signal subcarrier point after seeking the partial compensation for the time simultaneously takes described
The average value of performance number.
In specific implementation, it is provided according to above-mentioned agreement, the reference signal after the partial compensation for the time can be sought
The performance number of the channel estimation value of carrier wave point is simultaneously averaged.Due to the channel estimation value of the reference signal subcarrier point be through
Partial compensation for the time processing has been crossed, therefore the temporal accuracy of the estimated value can be improved.
S16: subtracting the difference that the noise estimation value obtains for the average value, the reference as the cell to be measured
Signal reception power value.
In specific implementation, according to the definition of the Reference Signal Received Power value, the average value can be subtracted into institute
The difference that noise estimation value obtains is stated, the Reference Signal Received Power value as the cell to be measured.
It is above-mentioned small the following provide may be implemented to more fully understand those skilled in the art and realizing the present invention
The device of the method for region measurement.
Fig. 2 shows the structural schematic diagrams of the device of one of one embodiment of the invention cell measurement.Described device can
To include: Fourier transform unit 1, channel estimating unit 2, time offset estimation unit 3, partial compensation for the time unit 4, computing unit 5,
In:
The Fourier transform unit 1 obtains frequency domain suitable for carrying out Fourier transformation to the time domain baseband signals received
Signal.
The channel estimating unit 2 obtains the frequency-region signal load suitable for carrying out channel estimation to the frequency-region signal
The channel estimation value and noise estimation value of wave point.
The time offset estimation unit 3, suitable for using the channel estimation of the reference signal of adjacent position in same OFDM symbol
Value carries out time offset estimation.
The partial compensation for the time unit 4, suitable for according to the time offset estimation value to the frequency domain reference signal subcarrier point
Channel estimation value carries out partial compensation for the time.
The computing unit 5, suitable for seeking the channel estimation of the reference signal subcarrier point after the partial compensation for the time
The performance number of value is simultaneously averaged, and the average value is subtracted the difference that the noise estimation value obtains, as described to be measured
Measure the Reference Signal Received Power value of cell.
In specific implementation, described device can also include: adjustment unit 6, the adjustment unit 6 be suitable for according to it is described when
Inclined estimated value adjusts the window's position of the Fourier transformation.
In specific implementation, described device can also include: frequency deviation estimating unit 7 and frequency offset compensation element 10, in which:
The frequency deviation estimating unit 7, the reference signal subcarrier point of the same position suitable for using different OFDM symbols
Channel estimation value carries out offset estimation, obtains offset estimation value.
The frequency offset compensation element 10, suitable for according to the offset estimation value to the time domain baseband signals received into
Line frequency offset compensation.
In an embodiment of the present invention, the frequency deviation estimating unit 7, suitable for by the same position of the different OFDM symbols
Reference signal subcarrier point channel estimation value conjugate multiplication, the first end value is obtained, then according to first end value
Phase information obtain the offset estimation value.
In specific implementation, the frequency deviation estimating unit 7 is suitable for obtaining the offset estimation value according to following formula:
Wherein Δ f is offset estimation value, and Dt is the reference signal
At the interval of frequency domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l difference
Indicate symbol serial number and OFDM serial number with the reference signal, HpK, lFor the channel estimation of the reference signal subcarrier point
Value.
In specific implementation, the device of the cell measurement can also include: the first filter unit 8.First filtering
Unit 8 is suitable for being filtered the compensated frequency domain reference signal of the frequency deviation.
In specific implementation, the time offset estimation unit 3, suitable for by the reference signal subcarrier point of the adjacent position
Channel estimation value conjugate multiplication, as the second end value, when obtaining described then according to the phase information of second end value
Inclined estimated value.
In an embodiment of the present invention, the time offset estimation unit 3 is suitable for obtaining the time offset estimation according to following formula
Value:
Wherein the Δ τ is offset estimation value, and Df is the reference
For signal at the interval of time domain, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, k and l
Respectively indicate symbol serial number and OFDM serial number with the reference signal, HpK, lChannel for the reference signal subcarrier point is estimated
Evaluation.
In specific implementation, the value of the Df can be 3, or 6.
In an embodiment of the present invention, described device can also include: the second filter unit 9.Second filter unit 9
Suitable for being filtered to the frequency domain reference signal after the partial compensation for the time.
The embodiment of the invention also provides a kind of user equipment, the user equipment may include being retouched in above embodiments
The device for the cell measurement stated.
It should be noted that the user equipment includes but is not limited to mobile phone, notebook, plate in the embodiment of the present invention
The computer equipment or portable equipment that computer and vehicle-mounted computer etc. are suitable for using on the move.The user equipment can be with base
Station is communicated, and the communication includes receiving the signal and send signal etc. to base station that base station is sent.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can store in computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (21)
1. a kind of method of cell measurement characterized by comprising
Fourier transformation is carried out to the time domain baseband signals received and obtains frequency-region signal；
Channel estimation is carried out to the reference signal in the frequency-region signal and obtains the channel of the frequency domain reference signal subcarrier point
Estimated value and noise estimation value；
Time offset estimation is carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol, is obtained
Time offset estimation value；
Partial compensation for the time is carried out according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point；
The performance number of the channel estimation value of the reference signal subcarrier point after seeking the partial compensation for the time simultaneously takes the power
The average value of value；
The average value is subtracted into the difference that the noise estimation value obtains, the Reference Signal Received Power as cell to be measured
Value.
2. the method for cell measurement according to claim 1, which is characterized in that further include:
The window's position of the Fourier transformation is adjusted according to the time offset estimation value.
3. the method for cell measurement according to claim 1, which is characterized in that further include:
Offset estimation is carried out using the channel estimation value of the reference signal subcarrier point of the same position of different OFDM symbols, is obtained
Offset estimation value, the channel estimation value are the channel estimation value of the reference signal subcarrier point after the partial compensation for the time；
Frequency deviation compensation is carried out to the time domain baseband signals received according to the offset estimation value.
4. the method for cell measurement according to claim 3, which is characterized in that described using adjacent in same OFDM symbol
The channel estimation value of the reference signal subcarrier point of position carries out time offset estimation, obtains time offset estimation value, comprising:
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the same position of the different OFDM symbols, the is obtained
One end value；
The offset estimation value is obtained according to the phase information of first end value.
5. the method for cell measurement according to claim 4, which is characterized in that described to use phase on same OFDM symbol
The channel estimation value for the reference signal subcarrier point that ortho position is set carries out time offset estimation, obtains time offset estimation value, comprising:
Wherein Δ f is offset estimation value, and Dt is the reference signal in frequency domain
Interval, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, and k and l respectively indicate band
The symbol serial number and OFDM serial number of the reference signal, HpK, lFor the channel estimation value of the reference signal subcarrier point.
6. the method for cell measurement according to claim 3, which is characterized in that further include: to the offset estimation value into
Row filtering.
7. the method for cell measurement according to claim 1, which is characterized in that described using adjacent in same OFDM symbol
The channel estimation value of the reference signal subcarrier point of position carries out time offset estimation, obtains time offset estimation value, comprising:
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as the second end value；
The time offset estimation value is obtained according to the phase information of second end value.
8. the method for cell measurement according to claim 7, which is characterized in that described using adjacent in same OFDM symbol
The channel estimation value of the reference signal subcarrier point of position carries out time offset estimation, obtains time offset estimation value, comprising:
Wherein the Δ τ is time offset estimation value, DfExist for the reference signal
The interval of time domain, L are the numbers of the reference signal, and N is the number of the resource block in the bandwidth measured, and k and l distinguish table
Show symbol serial number and OFDM serial number with the reference signal, HpK, lFor the channel estimation value of the reference signal subcarrier point.
9. the method for cell measurement according to claim 8, which is characterized in that the DfValue be 3 or 6.
10. the method for cell measurement according to claim 1, which is characterized in that further include: to the time offset estimation value into
Row filtering.
11. a kind of device of cell measurement characterized by comprising
Fourier transform unit obtains frequency-region signal suitable for carrying out Fourier transformation to the time domain baseband signals received；
Channel estimating unit obtains the frequency domain reference signal subcarrier point suitable for carrying out channel estimation to the frequency-region signal
Channel estimation value and noise estimation value；
Time offset estimation unit, the channel estimation value of the reference signal subcarrier point suitable for using adjacent position in same OFDM symbol
Time offset estimation is carried out, time offset estimation value is obtained；
Partial compensation for the time unit, suitable for the channel estimation value according to the time offset estimation value to the frequency domain reference signal subcarrier point
Carry out partial compensation for the time；
Computing unit, suitable for seeking the performance number of the channel estimation value of the reference signal subcarrier point after the partial compensation for the time and taking
The average value of the performance number, and the average value is subtracted into the difference that the noise estimation value obtains, as cell to be measured
Reference Signal Received Power value.
12. the device of cell measurement according to claim 11, which is characterized in that further include:
Adjustment unit, suitable for adjusting the window's position of the Fourier transformation according to the time offset estimation value.
13. the device of cell measurement according to claim 11, which is characterized in that further include:
Frequency deviation estimating unit, the channel estimation value of the reference signal subcarrier point of the same position suitable for using different OFDM symbols
Offset estimation is carried out, offset estimation value is obtained；
Frequency offset compensation element, suitable for carrying out frequency deviation benefit to the time domain baseband signals received according to the offset estimation value
It repays.
14. the device of cell measurement according to claim 13, which is characterized in that the frequency deviation estimating unit, being suitable for will
The channel estimation value conjugate multiplication of the reference signal subcarrier point of the same position of the difference OFDM symbol, obtains the first result
Value；
The offset estimation value is obtained according to the phase information of first end value.
15. the device of cell measurement according to claim 14, which is characterized in that the frequency deviation estimating unit is suitable for root
The offset estimation value is obtained according to following formula:
Wherein Δ f is offset estimation value, and Dt is the reference signal in frequency domain
Interval, L is the number of the reference signal, and N is the number of the resource block in the bandwidth measured, and k and l respectively indicate band
The symbol serial number and OFDM serial number of the reference signal, HpK, lFor the channel estimation value of the reference signal subcarrier point.
16. the device of cell measurement according to claim 13, which is characterized in that further include:
First filter unit, suitable for being filtered to the compensated frequency domain reference signal of the frequency deviation.
17. the device of cell measurement according to claim 11, which is characterized in that the time offset estimation unit, being suitable for will
The channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as the second end value；
The time offset estimation value is obtained according to the phase information of second end value.
18. the device of cell measurement according to claim 17, which is characterized in that the time offset estimation unit is suitable for root
The time offset estimation value is obtained according to following formula:
Wherein the Δ τ is time offset estimation value, DfExist for the reference signal
The interval of time domain, L are the numbers of the reference signal, and N is the number of the resource block in the bandwidth measured, and k and l distinguish table
Show symbol serial number and OFDM serial number with the reference signal, HpK, lFor the channel estimation value of the reference signal subcarrier point.
19. the device of cell measurement according to claim 18, which is characterized in that the DfValue be 3 or 6.
20. the device of cell measurement according to claim 18, which is characterized in that further include: the second filter unit is suitable for
Frequency domain reference signal after the partial compensation for the time is filtered.
21. a kind of user equipment characterized by comprising the described in any item cell measurements of claim 11- claim 20
Device.
Priority Applications (1)
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| CN108156104B (en) * | 2018-01-31 | 2021-02-02 | 重庆邮电大学 | Decimal frequency offset estimation method based on combination of CP and CRS |
| CN108809868B (en) * | 2018-04-23 | 2020-07-07 | 中国科学院自动化研究所 | Channel estimation method and system based on 5G communication network |
| CN109257308B (en) * | 2018-09-19 | 2021-01-05 | 中国联合网络通信集团有限公司 | Phase noise estimation method and device |
| CN113271279B (en) * | 2021-05-14 | 2022-07-05 | 成都爱瑞无线科技有限公司 | High-precision detection method for random access channel of narrow-band Internet of things |
| CN114665994B (en) * | 2022-03-17 | 2023-07-14 | Oppo广东移动通信有限公司 | Method, apparatus, device and readable storage medium for estimating received power |
| CN114760177B (en) * | 2022-03-22 | 2024-02-13 | 佰路威科技(北京)有限公司 | Data receiving method in multipoint-to-point system and related equipment |
| CN117560100B (en) * | 2023-12-29 | 2024-04-19 | 深圳国人无线通信有限公司 | RSRP measurement method and device for SRS signals in base station |
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