CN106533820A - Cell measurement method, device and user equipment - Google Patents
Cell measurement method, device and user equipment Download PDFInfo
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Abstract
The invention provides a cell measurement method, a device and user equipment. The cell measurement method comprises the steps of subjecting a received time-domain baseband signal to fourier transform to obtain a frequency-domain signal; subjecting a reference signal in the frequency-domain signal to channel estimation to obtain the channel estimated values of the sub-carrier points of the frequency-domain reference signal and a noise estimated value; subjecting the channel estimated values of the adjacent sub-carrier points of the reference signal on the same OFDM symbol to time offset estimation to obtain a time offset estimated value; according to the time offset estimated value, subjecting the channel estimated values of the sub-carrier points of the reference signal to time offset compensation; calculating the power values of the channel estimated values of the sub-carrier points of the reference signal after the time offset compensation step and figuring out the average value of the power values; subjecting the average value by the noise estimated value and adopting the obtained difference value as the reference signal receiving power value of a to-be-measured cell. According to the technical scheme of the invention, the time offset resistance and the frequency offset resistance of measurement results can be improved. Meanwhile, the robustness is improved.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of method of cell measurement, device and user
Equipment.
Background technology
The development of mobile communication has added data service transition from initial speech business to speech business, and
Data service presents obvious acceleration mode, and increasing user adds 3G (Third Generation) Moblie now
(3G) grid.For more preferable mobile data experience, the transmittability of 3G systems gradually shows
Go out deficiency, then the long evolving system (Long Term Evolution, LTE) of 3G systems arises at the historic moment.
LTE is improved and is enhanced the aerial access technology of 3G, using OFDM (Orthogonal
Frequency Division Multiplexing, OFDM) technology and multiple-input, multiple-output (Multiple-Input
Multiple-Output, MIMO) technology as its wireless network evolution sole criterion, design most relative superiority or inferiority
Scanning frequency rate 100Mbps, upstream rate 50Mbps.LTE technologies will greatly promote user to mobile communication business
Experience, be that operator brings more technologies and cost advantage.Meanwhile, the appearance of LTE technologies is also consolidated
The leading position of legacy cellular mobile technology.
In mobile radio system, the Seamless Mobile of user equipment (User Equipment, UE) is
Principal character.UE states in a network are divided into idle condition and connection status, therefore the mobile management of UE
Mobile management under the mobile management being broadly divided under idle condition and connection status.Shifting under idle condition
It is dynamic to be mainly by cell reselection to realize, independently carried out by UE；Movement under connection status is mainly logical
Cross cell switching to realize, carried out by network side (eNodeB) control.As cell reselection and cell are cut
The foundation changed is exactly UE to Serving cell and the measurement result of adjacent cell, therefore measurement result is for realizing UE
Seamless Mobile it is most important.
At present, when the measuring method of cell is provided for measurement result by other modules beyond measurement apparatus
Inclined or frequency deviation information.
But, this cell measuring method be likely to result in measurement result it is anti-when reduce with the performance of frequency deviation partially,
And reduce robustness.
The content of the invention
The problem that the present invention is solved be lifted measurement result it is anti-when performance partially with frequency deviation, and improve robust
Property.
For solving the above problems, the present invention provides a kind of method of cell measurement, and methods described includes：
Time domain baseband signals to receiving carry out Fourier transformation and obtain frequency-region signal；
Channel estimation is carried out to the reference signal in the frequency-region signal obtains the frequency domain reference signal load
The channel estimation value of wave point and noise estimation value；
Carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol
Time offset estimation, obtains time offset estimation value；
When being carried out to the channel estimation value of the frequency domain reference signal subcarrier point according to the time offset estimation value
Offset compensation；
Ask for the performance number of channel estimation value of the reference signal subcarrier point after the partial compensation for the time simultaneously
Take the meansigma methodss of the performance number；
The meansigma methodss are deducted into the difference that the Noise Estimation is worth to, as the cell to be measured
Reference Signal Received Power value.
Alternatively, methods described also includes：
The window's position of the Fourier transformation is adjusted according to the time offset estimation value.
Alternatively, methods described also includes：
Carried out using the channel estimation value of the reference signal subcarrier point of the same position of different OFDM symbols
Offset estimation, obtains offset estimation value, and the channel estimation value is the reference signal after the partial compensation for the time
The channel estimation value of subcarrier point；
Frequency deviation compensation is carried out to the time domain baseband signals for receiving according to the offset estimation value.
Alternatively, the offset estimation, including：
By the channel estimation value of the reference signal subcarrier point of the same position of the different OFDM symbols altogether
Yoke is multiplied, and obtains the first end value；
The offset estimation value is obtained according to the phase information of first end value.
Alternatively, the offset estimation, including：
Wherein Δ f is offset estimation value, and Dt is the reference
At the interval of frequency domain, L is the number of the reference signal to signal, and N is the resource with alleviating distention in middle-JIAO for measuring
The number of block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers, Hp respectivelyK, l
For the channel estimation value of the reference signal subcarrier point.
Alternatively, methods described also includes：The frequency deviation offset is filtered.
Alternatively, the time offset estimation, including：
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as second
End value；
The time offset estimation value is obtained according to the phase information of second end value.
Alternatively, the time offset estimation, including：
Wherein described Δ τ be offset estimation value, DfFor described
At the interval of time domain, L is the number of the reference signal to reference signal, and N is measured with alleviating distention in middle-JIAO
The number of Resource Block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers respectively,
HpK, lFor the channel estimation value of the reference signal subcarrier point.
Alternatively, the value of the Df is 3 or 6.
Alternatively, methods described also includes：The time offset estimation value is filtered.
A kind of device of cell measurement, described device include：
Fourier transform unit, be suitable to the time domain baseband signals to receiving carry out Fourier transformation obtain frequency
Domain signal；
Channel estimating unit, is suitable to carry out the frequency-region signal channel estimation and obtains the frequency domain reference letter
The channel estimation value of sub-carriers point and noise estimation value；
Time offset estimation unit, is adapted in use to the reference signal subcarrier of adjacent position in same OFDM symbol
The channel estimation value of point carries out time offset estimation, obtains time offset estimation value；
Partial compensation for the time unit, is suitable to according to the time offset estimation value to the frequency domain reference signal subcarrier point
Channel estimation value carry out partial compensation for the time；
Computing unit, the channel estimation value of the reference signal subcarrier point after being suitable to ask for the partial compensation for the time
Performance number and take the meansigma methodss of the performance number, and the meansigma methodss deducted into the Noise Estimation be worth
The difference for arriving, used as the Reference Signal Received Power value of the cell to be measured.
Alternatively, described device also includes：
Adjustment unit, is suitable to adjust the window's position of the Fourier transformation according to the time offset estimation value.
Alternatively, described device also includes：
Frequency deviation estimating unit, is adapted in use to the reference signal subcarrier of the same position of different OFDM symbols
The channel estimation value of point carries out offset estimation, obtains offset estimation value；
Frequency offset compensation element, is suitable to according to the offset estimation value to the time domain baseband signals for receiving
Carry out frequency deviation compensation.
Alternatively, the frequency deviation estimating unit, is suitable to the same position of the different OFDM symbols
The channel estimation value conjugate multiplication of reference signal subcarrier point, obtains the first end value；
The offset estimation value is obtained according to the phase information of first end value.
Alternatively, the frequency deviation estimating unit, is suitable to obtain the offset estimation value according to following formula：
Wherein Δ f is offset estimation value, and Dt is the reference
At the interval of frequency domain, L is the number of the reference signal to signal, and N is the resource with alleviating distention in middle-JIAO for measuring
The number of block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers, Hp respectivelyK, l
For the channel estimation value of the reference signal subcarrier point.
Alternatively, described device also includes：
First filter unit, the frequency domain reference signal after being suitable to compensate the frequency deviation are filtered.
Alternatively, the time offset estimation unit, is suitable to the reference signal subcarrier point of the adjacent position
Channel estimation value conjugate multiplication, as the second end value；
The time offset estimation value is obtained according to the phase information of second end value.
Alternatively, the time offset estimation unit, is suitable to obtain the time offset estimation value according to following formula：
Wherein described Δ τ be offset estimation value, DfFor described
At the interval of time domain, L is the number of the reference signal to reference signal, and N is measured with alleviating distention in middle-JIAO
The number of Resource Block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers respectively,
HpK, lFor the channel estimation value of the reference signal subcarrier point.
Alternatively, the value of Df described in described device is 3 or 6.
Alternatively, described device also includes：Second filter unit, is suitable to the frequency after the partial compensation for the time
Domain reference signal is filtered.
A kind of user equipment, the user equipment include：The device of the cell measurement described in any of the above item.
Compared with prior art, technical scheme has advantages below：
It is inclined when being carried out by using the channel estimation value of the reference signal of adjacent position in same OFDM symbol
Estimate, then according to channel estimation value of the time offset estimation value to the frequency domain reference signal subcarrier point
Partial compensation for the time is carried out, due to the breath that believes one side only when providing using measurement apparatus itself, such that it is able to lift measurement knot
Inclined performance when really anti-, and improve the robustness of measurement.
And line frequency is entered by using the channel estimation value of the reference signal of the same position of different OFDM symbols
Estimate partially, frequency deviation benefit is carried out to the time domain baseband signals for receiving then according to the offset estimation value
Repay, due to providing frequency deviation information in itself using measurement apparatus, such that it is able to lift the anti-frequency deviation of measurement result
Performance, and improve the robustness of measurement.
Further, as frequency deviation compensation can be carried out to time-domain signal before time domain Fourier transformation, so as to
Can when cell switches, when be supplied to Serving cell with the information of frequency deviation partially, such that it is able to be lifted be
The performance of system.
Further, due in cell reselection, new Serving cell can obtain immediately signal it is new when it is inclined
With frequency deviation information, such that it is able to improve throughput performance now.
Description of the drawings
Fig. 1 is a kind of schematic flow sheet of the method for the cell measurement in the embodiment of the present invention；
Fig. 2 is a kind of schematic flow sheet of the device of the cell measurement in the embodiment of the present invention.
Specific embodiment
According to third generation partner program (3rd Generation Partnership Project, 3GPP)
The description of TS36.214 specifications understands, in LTE system, has three in measurement：1) reference signal connects
Power (Reference Signal Receiving Power, RSRP) is received, its definition is little in Measurement bandwidth
The linear averaging of area's specific reference signals (Cell-specific Reference Signal, CRS) power；2)
Carrier received signal intensity indicates (Received Signal Strength Indication, RSSI), its definition
It is the linear averaging of the symbol power with reference signal in Measurement bandwidth, including desired signal, cochannel
The power of interference, adjacent-channel interference and thermal noise；3) Reference Signal Received Quality (Reference Signal
Receiving Quality, RSRQ), its definition is that N × RSRP/RSSI, RSRP and RSSI are shown in above-mentioned
Definition, N is the number of Resource Block in Measurement bandwidth (Resource Block, RB).Wherein RSRP and
Two values of RSRQ will be reported, and RSRP indicates the absolute power of the reference signal for receiving, and RSRQ refers to
Show reference signal power and receive the relative ratio of general power.
From the definition of RSRP and RSSI, the measurement of user equipment (User Equipment, UE)
Mainly the symbol with CRS in descending sub frame is carried out.Specifically, the RSSI that survey calculation includes
Calculate, RSRP is calculated and RSRQ is calculated, respectively such as following formula：
In formula (1), RK, lIt is the data of the symbol in frequency domain of the band CRS for receiving, L is band CRS
Symbol number, N is the number of the RB with alleviating distention in middle-JIAO for measuring, and k and l represents band CRS respectively
Symbol sequence number and subcarrier sequence number.
In formula (2), HK, lFor the channel impulse response of time domain, L is the number of the symbol with CRS,
NcrsIt is the number of CRS, k and l represents the symbol sequence number with CRS and subcarrier sequence number respectively.
In formula (3), N is the number of the RB with alleviating distention in middle-JIAO for measuring, RSRP's and RSSI
It is as defined above.
At present, when the measuring method of cell is provided for measurement result by other modules beyond measurement apparatus
Inclined or frequency deviation information.But, this cell measuring method be likely to result in measurement result it is anti-when partially and frequency deviation
Ability, robustness is weak.
For problem described above, method, device and the use of cell measurement is embodiments provided
Family equipment, is carried out by using the channel estimation value of the reference signal of adjacent position in same OFDM symbol
Time offset estimation, carries out partial compensation for the time then according to the time offset estimation value to the frequency domain reference signal.And
Frequency deviation is carried out by using the channel estimation value of the reference signal of the same position of different OFDM symbols to estimate
Meter, carries out frequency deviation compensation then according to the offset estimation value to the time domain reference signal for receiving,
Inclined and frequency deviation information during due to being provided using measurement apparatus itself, such that it is able to lift the anti-frequency deviation of measurement result
Performance, and improve the robustness of measurement.
It is understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings
The specific embodiment of the present invention is described in detail.
Fig. 1 shows a kind of schematic flow sheet of the method for the cell measurement in the embodiment of the present invention.Below
The step that implements of the measuring method is described in detail with reference to Fig. 1.
S11：Time domain baseband signals to receiving carry out Fourier transformation and obtain frequency-region signal.
In being embodied as, as the reference signal of frequency domain is more convenient to process and modulates, can be to receiving
Time domain baseband signals carry out Fourier transformation and obtain 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
The channel estimation value of subcarrier point and noise estimation value.
In being embodied as, channel estimation can be carried out to the frequency-region signal and obtains the frequency domain reference letter
The channel estimation value of sub-carriers point and noise estimation value, such that it is able to know the configured transmission of transmission channel.
S13：Using the channel estimation of the reference signal subcarrier point of adjacent position in same OFDM symbol
Value carries out time offset estimation, obtains time offset estimation value.
In being embodied as, the characteristics of have close due to the subcarrier upper signal channel estimated value of adjacent position,
Can be carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol
Time offset estimation, obtains time offset estimation value.
In an embodiment of the present invention, can first by the letter of the reference signal subcarrier point of the adjacent position
Road estimated value conjugate multiplication, as the second end value, then according to the phase information of second end value
Obtain the time offset estimation value.
In an embodiment of the present invention, it is possible to use formula (4) obtains the time offset estimation value：
Wherein, parameter, Δ τ be time offset estimation value, DfIt is the reference signal at the interval of time domain, L is institute
State the number of reference signal, N is the number of the Resource Block with alleviating distention in middle-JIAO for measuring, k and l is represented respectively
Symbol sequence number with the reference signal and OFDM sequence numbers, HpK, lFor the reference signal subcarrier point
Channel estimation value.
In an embodiment of the present invention, the DfValue be 3, in an alternative embodiment of the invention, institute
State DfValue be 6.
In being embodied as, in order that being carried to frequency domain reference signal according to the time offset estimation value
The channel estimation value of wave point carries out the process of partial compensation for the time and more smooths, and the time offset estimation value can be entered
Row filtering.
S14：The channel estimation value of the frequency domain reference signal subcarrier point is entered according to the time offset estimation value
Row partial compensation for the time.
In being embodied as, in order to improve signal accuracy in time, can according to it is described when
Estimated value partially carries out partial compensation for the time 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 position of the change of Fourier next time
Put, to obtain more accurate signal interception position, can be with according to time offset estimation value adjustment
The window's position of Fourier transformation.
In being embodied as, in order to lift the accuracy on the reference signal frequency, it is possible to use different
The channel estimation value of the reference signal subcarrier point of the same position of OFDM symbol carries out offset estimation, and
And frequency deviation compensation is carried out to the time domain baseband signals for receiving according to the offset estimation value.
In being embodied as, by the reference signal subcarrier point of the same position of the different OFDM symbols
Channel estimation value conjugate multiplication, obtain the first end value, then according to the phase place of first end value
Offset estimation value described in acquisition of information.
In an embodiment of the present invention, the offset estimation value can be obtained using formula (5)：
Wherein, f be offset estimation value, Dt be the reference signal at the interval of frequency domain, L is the reference
The number of signal, N is the number of the Resource Block with alleviating distention in middle-JIAO for measuring, and k and l is represented respectively with described
The symbol sequence number and OFDM sequence numbers of reference signal, HpK, lChannel for the reference signal subcarrier point is estimated
Evaluation.
Specified according to the agreement of LTE/LTEA, when the type of Cyclic Prefix is conventional cyclic prefix, frequency
Estimate partially to be estimated between symbol 4 and symbol 11, it is also possible in symbol in symbol 0 and symbol 7
Number 0 with symbol 4, estimated between symbol 7 and symbol 11, can also be symbol 0 and symbol 4,
Symbol 7 and symbol 11, are estimated between symbol 4 and symbol 7.When the type of Cyclic Prefix is extension
During 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 being embodied as, in order that frequency deviation process is more smoothed, can also be to the offset estimation value
It is filtered.
S15：Ask for the performance number of channel estimation value of the reference signal subcarrier point after the partial compensation for the time simultaneously
Take the meansigma methodss of the performance number.
In being embodied as, specified according to above-mentioned agreement, the ginseng after the partial compensation for the time can be asked for
Examine the performance number of the channel estimation value of channel distortion experienced point and average.As reference signal is carried
The channel estimation value of wave point have passed through partial compensation for the time process, therefore can improve on the estimated value time
Accuracy.
S16：The meansigma methodss are deducted into the difference that the Noise Estimation is worth to, as described to be measured little
The Reference Signal Received Power value in area.
In being embodied as, according to the definition of the Reference Signal Received Power value, can be described average
Value deducts the difference that the Noise Estimation is worth to, and receives work(as the reference signal of the cell to be measured
Rate value.
For causing those skilled in the art to more fully understand and realize the present invention, the following providing can be real
The device of the method for existing above-mentioned cell measurement.
Fig. 2 shows a kind of structural representation of the device of the cell measurement in one embodiment of the invention.Institute
Stating device can include：Fourier transform unit 1, channel estimating unit 2, time offset estimation unit 3, when
Offset compensation unit 4, computing unit 5, wherein：
The Fourier transform unit 1, is suitable to the time domain baseband signals to receiving and carries out Fourier transformation obtain
To frequency-region signal.
The channel estimating unit 2, is suitable to carry out the frequency-region signal channel estimation and obtains the frequency domain letter
The channel estimation value of sub-carriers point and noise estimation value.
The time offset estimation unit 3, is adapted in use to the reference signal of adjacent position in same OFDM symbol
Channel estimation value carry out time offset estimation.
The partial compensation for the time unit 4, is suitable to carry frequency domain reference signal according to the time offset estimation value
The channel estimation value of wave point carries out partial compensation for the time.
The computing unit 5, the letter of the reference signal subcarrier point after being suitable to ask for the partial compensation for the time
The performance number of road estimated value is simultaneously averaged, and the meansigma methodss are deducted what the Noise Estimation was worth to
Difference, used as the Reference Signal Received Power value of the cell to be measured.
In being embodied as, described device can also include：Adjustment unit 6, the adjustment unit 6 are suitable to
The window's position of the Fourier transformation is adjusted according to the time offset estimation value.
In being embodied as, described device can also include：Frequency deviation estimating unit 7 and frequency offset compensation element
10, wherein：
The frequency deviation estimating unit 7, is adapted in use to the reference signal of the same position of different OFDM symbols
The channel estimation value of subcarrier point carries out offset estimation, obtains offset estimation value.
The frequency offset compensation element 10, is suitable to according to the offset estimation value to the time domain base for receiving
Band signal carries out frequency deviation compensation.
In an embodiment of the present invention, the frequency deviation estimating unit 7, is suitable to accord with the different OFDM
Number same position reference signal subcarrier point channel estimation value conjugate multiplication, obtain the first end value,
The offset estimation value is obtained then according to the phase information of first end value.
In being embodied as, the frequency deviation estimating unit 7 is suitable to be estimated according to following formula acquisition frequency deviation
Evaluation：
Wherein Δ f is offset estimation value, and Dt is the reference
At the interval of frequency domain, L is the number of the reference signal to signal, and N is the resource with alleviating distention in middle-JIAO for measuring
The number of block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers, Hp respectivelyK, l
For the channel estimation value of the reference signal subcarrier point.
In being embodied as, the device of the cell measurement can also include：First filter unit 8.Institute
State the frequency domain reference signal after the first filter unit 8 is suitable to compensate the frequency deviation to be filtered.
In being embodied as, the time offset estimation unit 3 is suitable to reference signal of the adjacent position
The channel estimation value conjugate multiplication of carrier wave point, as the second end value, then according to second end value
Phase information obtain the time offset estimation value.
In an embodiment of the present invention, the time offset estimation unit 3, is suitable to according to following formula are obtained
Time offset estimation value：
Wherein described Δ τ is offset estimation value, and Df is described
At the interval of time domain, L is the number of the reference signal to reference signal, and N is measured with alleviating distention in middle-JIAO
The number of Resource Block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers respectively,
HpK, lFor the channel estimation value of the reference signal subcarrier point.
In being embodied as, the value of the Df can be 3, or 6.
In an embodiment of the present invention, described device can also include：Second filter unit 9.Described second
Filter unit 9 is suitable to be filtered the frequency domain reference signal after the partial compensation for the time.
The embodiment of the present invention additionally provides a kind of user equipment, and the user equipment can include implementing above
The device of the cell measurement described in example.
It should be noted that in the embodiment of the present invention, the user equipment includes but is not limited to mobile phone, pen
Note sheet, panel computer and vehicle-mounted computer etc. are suitable to computer equipment or portable equipment used in movement.
The user equipment can be communicated with base station, it is described communication include receive base station transmission signal and
To base station sending signal etc..
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Suddenly can be by program to instruct the hardware of correlation to complete, the program can be stored in can with computer
Read in storage medium, storage medium can include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore the guarantor of the present invention
Shield scope should be defined by claim limited range.
Claims (21)
1. a kind of method of cell measurement, it is characterised in that include：
Time domain baseband signals to receiving carry out Fourier transformation and obtain frequency-region signal；
Channel estimation is carried out to the reference signal in the frequency-region signal obtains the frequency domain reference signal subcarrier
The channel estimation value of point and noise estimation value；
Carried out using the channel estimation value of the reference signal subcarrier point of adjacent position in same OFDM symbol
Time offset estimation, obtains time offset estimation value；
It is inclined when being carried out to the channel estimation value of the frequency domain reference signal subcarrier point according to the time offset estimation value
Compensation；
Ask for the performance number of the channel estimation value of the reference signal subcarrier point after the partial compensation for the time and take
The meansigma methodss of the performance number；
The meansigma methodss are deducted into the difference that the Noise Estimation is worth to, as the ginseng of the cell to be measured
Examine signal reception power value.
2. the method for cell measurement according to claim 1, it is characterised in that also 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, it is characterised in that also include：
Carried out using the channel estimation value of the reference signal subcarrier point of the same position of different OFDM symbols
Offset estimation, obtains offset estimation value, and the channel estimation value is the reference letter after the partial compensation for the time
The channel estimation value of sub-carriers point；
Frequency deviation compensation is carried out to the time domain baseband signals for receiving according to the offset estimation value.
4. the method for cell measurement according to claim 3, it is characterised in that described using same OFDM
On symbol, the channel estimation value of the reference signal subcarrier point of adjacent position carries out time offset estimation, when obtaining
Inclined estimated value, including：
By the channel estimation value of the reference signal subcarrier point of the same position of the different OFDM symbols altogether
Yoke is multiplied, and obtains the first 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, it is characterised in that described using same OFDM
On symbol, the channel estimation value of the reference signal subcarrier point of adjacent position carries out time offset estimation, when obtaining
Inclined estimated value, including：
Wherein Δ f is offset estimation value, and Dt is for described with reference to letter
Number at the interval of frequency domain, L is the number of the reference signal, and N is the money with alleviating distention in middle-JIAO for measuring
The number of source block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers respectively,
HpK, lFor the channel estimation value of the reference signal subcarrier point.
6. the method for cell measurement according to claim 3, it is characterised in that also include：To the frequency
Offset compensation value is filtered.
7. the method for cell measurement according to claim 1, it is characterised in that described using same OFDM
On symbol, the channel estimation value of the reference signal subcarrier point of adjacent position carries out time offset estimation, when obtaining
Inclined estimated value, including：
By the channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as the second knot
Fruit is worth；
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, it is characterised in that described using same OFDM
On symbol, the channel estimation value of the reference signal subcarrier point of adjacent position carries out time offset estimation, when obtaining
Inclined estimated value, including：
Wherein described Δ τ be offset estimation value, DfFor the ginseng
Signal is examined at the interval of time domain, L is the number of the reference signal, and N is the band alleviating distention in middle-JIAO for measuring
Resource Block number, k and l represents the symbol sequence number with the reference signal and OFDM sequences respectively
Number, HpK, lFor the channel estimation value of the reference signal subcarrier point.
9. the method for cell measurement according to claim 8, it is characterised in that the DfValue be 3
Or 6.
10. the method for cell measurement according to claim 1, it is characterised in that also include：To it is described when
Estimated value partially is filtered.
11. a kind of devices of cell measurement, it is characterised in that include：
Fourier transform unit, is suitable to the time domain baseband signals to receiving and carries out Fourier transformation obtain frequency domain
Signal；
Channel estimating unit, is suitable to carry out channel estimation to the frequency-region signal obtain the frequency domain reference signal
The channel estimation value of subcarrier point and noise estimation value；
Time offset estimation unit, is adapted in use to the reference signal subcarrier point of adjacent position in same OFDM symbol
Channel estimation value carry out time offset estimation, obtain time offset estimation value；
Partial compensation for the time unit, is suitable to 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；
Computing unit, the channel estimation value of the reference signal subcarrier point after being suitable to ask for the partial compensation for the time
Performance number simultaneously takes the meansigma methodss of the performance number, and the meansigma methodss are deducted the Noise Estimation is worth
The difference for arriving, used as the Reference Signal Received Power value of the cell to be measured.
The device of 12. cell measurements according to claim 11, it is characterised in that also include：
Adjustment unit, is suitable to adjust the window's position of the Fourier transformation according to the time offset estimation value.
The device of 13. cell measurements according to claim 11, it is characterised in that also include：
Frequency deviation estimating unit, is adapted in use to the reference signal subcarrier point of the same position of different OFDM symbols
Channel estimation value carry out offset estimation, obtain offset estimation value；
Frequency offset compensation element, is suitable to enter the time domain baseband signals for receiving according to the offset estimation value
Line frequency offset compensation.
The device of 14. cell measurements according to claim 13, it is characterised in that the frequency deviation estimating unit,
It is suitable to the channel estimation of the reference signal subcarrier point of the same position of the different OFDM symbols
Value conjugate multiplication, obtains the first end value；
The offset estimation value is obtained according to the phase information of first end value.
The device of 15. cell measurements according to claim 14, it is characterised in that the frequency deviation estimating unit,
It is suitable to obtain the offset estimation value according to following formula：
Wherein Δ f is offset estimation value, and Dt is for described with reference to letter
Number at the interval of frequency domain, L is the number of the reference signal, and N is the money with alleviating distention in middle-JIAO for measuring
The number of source block, k and l represent the symbol sequence number with the reference signal and OFDM sequence numbers respectively,
HpK, lFor the channel estimation value of the reference signal subcarrier point.
The device of 16. cell measurements according to claim 13, it is characterised in that also include：
First filter unit, the frequency domain reference signal after being suitable to compensate the frequency deviation are filtered.
The device of 17. cell measurements according to claim 11, it is characterised in that the time offset estimation unit,
It is suitable to the channel estimation value conjugate multiplication of the reference signal subcarrier point of the adjacent position, as
Two end values；
The time offset estimation value is obtained according to the phase information of second end value.
The device of 18. cell measurements according to claim 17, it is characterised in that the time offset estimation unit,
It is suitable to obtain the time offset estimation value according to following formula：
Wherein described Δ τ be offset estimation value, DfFor the ginseng
Signal is examined at the interval of time domain, L is the number of the reference signal, and N is the band alleviating distention in middle-JIAO for measuring
Resource Block number, k and l represents the symbol sequence number with the reference signal and OFDM sequences respectively
Number, HpK, lFor the channel estimation value of the reference signal subcarrier point.
The device of 19. cell measurements according to claim 18, it is characterised in that the DfValue be 3
Or 6.
The device of 20. cell measurements according to claim 18, it is characterised in that also include：Second filtering
Unit, is suitable to be filtered the frequency domain reference signal after the partial compensation for the time.
21. a kind of user equipmenies, it is characterised in that include：Described in claim 11- any one of claim 20
Cell measurement device.
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| 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 |
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