CN104079510B - Method and device for frequency offset estimation when user device switches cells - Google Patents
Method and device for frequency offset estimation when user device switches cells Download PDFInfo
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Abstract
The invention aims at providing a method and a device for frequency offset estimation when a user device switches cells. The method comprises the steps of obtaining the designated carrier frequency of a source station corresponding to the user device; determining a frequency offset coefficient according to the designated carrier frequency of the source station and a frequency offset value between the user device and the source station; estimating an initial frequency offset value between the user device and the source station according to the frequency offset coefficient and the designated carrier frequency of a target station corresponding to the user device, wherein the designated carrier frequency of the target station is different from the designated carrier frequency of the source station. Compared with the prior art, the frequency offset coefficient is obtained according to the frequency offset value between the user device and the source station and the designated carrier frequency of the source station, the initial frequency offset value between the user device and the source station according to the frequency offset coefficient and the designated carrier frequency of the target station after switching, the frequency offset convergence time is shortened, and the cell identification success rate is improved.
Description
Technical field
Estimate for carrying out frequency deviation at user equipment switching cell the present invention relates to communication technical field, more particularly to one kind
The technology of meter.
Background technology
Due to the different precision of different oscillators, user equipment needs to estimate its frequency deviation between base station in time.With
Family equipment is switched to after target BS, if it does not have suitable initial frequency deviation, it will take for the long period to do offset estimation
Convergence.Before offset estimation convergence, the performance of user equipment will be greatly reduced.Typically, when user equipment is with difference
Designated carrier frequency base station between when switching, the problem is especially protruded.Larger residual frequency difference will greatly reduce cell knowledge
The performance of other and measurement report, this will greatly reduce the possibility of handover success.
Therefore, after user equipment switches to target BS, suitable initial frequency deviation how is obtained, so as to increase switching
One of successful possibility, the problem as those skilled in the art's urgent need to resolve.
The content of the invention
It is an object of the invention to provide a kind of for carrying out the method for offset estimation and setting at user equipment switching cell
It is standby.
According to an aspect of the invention, there is provided a kind of for carrying out offset estimation at user equipment switching cell
Method, wherein, the method is comprised the following steps：
A obtains the designated carrier frequency of the source base station corresponding to user equipment；
B combines the frequency deviation between the user equipment and the source base station according to the designated carrier frequency of the source base station
Estimate, determines frequency deviation coefficient；
C combines the designated carrier frequency of target BS corresponding to the user equipment according to the frequency deviation coefficient, estimates
Count the initial frequency offset value of the user equipment and the target BS, wherein, the designated carrier frequency of the target BS different from
The designated carrier frequency of the source base station.
According to another aspect of the present invention, additionally provide and a kind of set for carrying out the user of offset estimation at switching cell
It is standby, wherein, the equipment includes：
Acquisition device, the designated carrier frequency for obtaining the source base station corresponding to user equipment；
Determining device, for the designated carrier frequency according to the source base station, and combines the user equipment and the source
Offset estimation value between base station, determines frequency deviation coefficient；
Estimation unit, for the finger of the target BS according to the frequency deviation coefficient, and with reference to corresponding to the user equipment
Determine carrier frequency, estimate the initial frequency offset value of the user equipment and the target BS, wherein, the carrier wave of the target BS
Designated carrier frequency of the frequency different from the source base station.
Compared with prior art, the present invention is according to the offset estimation value between user equipment and source base station, and the source base station
Designated carrier power, obtains frequency deviation coefficient, after handover according to the frequency deviation coefficient and the designated carrier frequency of target BS, obtains
Initial frequency offset value between user equipment and the target BS, accelerates the frequency deviation convergent time, improves the success of cell identification
Rate.
Brief description of the drawings
By the detailed description made to non-limiting example made with reference to the following drawings of reading, it is of the invention other
Feature, objects and advantages will become more apparent upon：
Fig. 1 shows the typical frequency deviation convergence curve that an initial frequency deviation is zero；
Fig. 2 shows the method for carrying out offset estimation at user equipment switching cell according to one aspect of the invention
Flow chart；
Fig. 3 show in accordance with a preferred embodiment of the present invention for carrying out offset estimation at user equipment switching cell
Schematic diagram；
Fig. 4 show according to a further aspect of the present invention for carrying out setting for offset estimation at user equipment switching cell
Standby schematic diagram.
Same or analogous reference represents same or analogous part in accompanying drawing.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
In existing communication system, after switching cell, initial frequency deviation is normally provided as zero to user equipment.But
Such case will cause overlong time, cell identification overlong time, the convergent overlong time of offset estimation that automatic frequency is calibrated
The problems such as.
Table 1 shows UTRAN (UMTS Terrestrial Radio Access Network, UMTS land wireless access
Net) cell fc-specific test FC parameter.
Table 1：The cell fc-specific test FC parameter of UTRAN
Wherein, AWGN (Additive White Gaussian Noise, additive white Gaussian noise) test parameter is from mark
Quasi- 3GPP36.133：A.5.2.1E-UTRAN FDD (Frequency Division Duplexing, FDD)-UTRAN
FDD switches.According to standard 3GPP36.133, the ratio of correct switching should be not less than what is observed in the test for repeating
90%.
CASE4 test parameters adjust the example from AWGN.
Table 2 shows the success rate (assuming that a process for cell identification needs 6ms) of the cell identification under different test parameters.
Table 2：Cell identification success rate under different test parameters
| Residual frequency difference | Propagation conditions | Success rate |
| 0Hz | AWGN | 100% |
| 0Hz | CASE4 | 99% |
| 200Hz | AWGN | 60% |
| 200Hz | CASE4 | 30% |
| 6kHz | AWGN | 30% |
| 6kHz | CASE4 | 10% |
The example of a prior art described below：
If for example, user equipment is from E-UTRAN (Evolved Universal Terrestrial Radio Access
Network, the Universal Terrestrial wireless access network of evolution) UTRAN is switched to, and user equipment uses VCO (Voltage
Controlled Oscillator, voltage-controlled oscillator) obtaining different local carrier frequencies.The voltage-controlled oscillating
Device is the electro coupled oscillator that frequency of oscillation is controlled by input voltage, it is assumed that its precision be 3ppm (precision may due to temperature,
It is aging etc. to change), the designated carrier frequency of E-UTRAN is 2.3GHz；The designated carrier frequency of UTRAN is 2GHz.Then exist
Preferable frequency deviation between user equipment and E-UTRAN should be 3ppm*2.3GHz=6.9kHz, the reason between user equipment and UTRAN
Think that frequency deviation should be 3ppm*2Ghz=6kHz.
Before the handover, it is assumed that frequency deviation of the user equipment by it and between E-UTRAN converges to 6.9kHz.
After handover, initial frequency deviation of the user equipment by it between UTRAN is set to zero.Therefore, the user equipment needs
Regular hour converges to 6kHz with the frequency deviation by it between UTRAN.
Fig. 1 shows the typical frequency deviation convergence curve that initial frequency deviation is zero.It shows that user equipment needs t1(such as t1=
200ms) converge to f1(such as f1=6kHz).
Because 6kHz is a larger value, user equipment one section of longer time will be needed user equipment and
Frequency deviation between UTRAN converges to 6kHz from 0Hz.
And the present invention proposes a kind of method for carrying out offset estimation at user equipment switching cell, it is according to user equipment
Offset estimation value between source base station obtains frequency deviation coefficient, after handover according to the frequency deviation coefficient and the designated carrier of target BS
Frequency, obtains the initial frequency offset value between user equipment and the target BS, accelerates the frequency deviation convergent time, improves cell knowledge
Other success rate.
Its concretism is as follows：
Generally, user equipment by way of frequency dividing or frequency multiplication, obtains difference by oscillator, such as voltage-controlled oscillator
Local carrier frequency.
Compared with the carrier frequency for being received from base station, the carrier frequency of user equipment modulation is normally stored down to ± 0.1ppm.
Within frequency difference between the real carrier frequency in base station and designated carrier frequency is normally controlled in 0.1ppm.
During switching, if user equipment is f with the offset estimation value of source base stationoffset1, the specified transmission of source base station is frequently
Rate is fsource_cell；The specified tranmitting frequency of target BS is ftargdt_cell, the initial frequency deviation of user equipment and the target BS
It is f to be worthInit_offset2。
Then：
1) frequency difference of the oscillator between user equipment and source base station isWithin.
2) frequency difference of the oscillator between user equipment and target BS existsWithin.
Therefore, if user equipment is setThen between user equipment and target BS
Residual frequency difference will be within 0.2ppm.Time needed for this causes offset estimation to restrain is much smaller than fInit_offset2=0 situation.
Fig. 2 shows the method for carrying out offset estimation at user equipment switching cell according to one aspect of the invention
Flow chart.
In step s 201, user equipment 1 obtains the designated carrier frequency of the source base station corresponding to user equipment.
Specifically, in step s 201, user equipment 1 is interacted by with source base station, obtains the specified load of the source base station
Wave frequency rate, for example, source base station is put into the specific fields of higher layer message by being assigned carrier frequency, and by the higher layer message
By way of agreement, send to user equipment 1, after user equipment 1 receives the higher layer message, in the specific word of the higher layer message
The designated carrier frequency of the source base station is extracted in section.Here, the higher layer message corresponding to different communication systems is typically different.Example
Such as when user equipment is switched to WCDMA (Wideband Code from LTE (Long Term Evolution, Long Term Evolution) system
Division Multiple Access, WCDMA) system when, user equipment is by the system broadcast message of LTE
System block of information SIB (System Information Block) obtains the corresponding designated carrier frequencies of the LTE, the system information block
Such as SIB6, different system cell information again, there is provided the cell of UTRAN relevant parameter, correlated carrier wave information again.
In step S202, user equipment 1 combines the user equipment according to the designated carrier frequency of the source base station
Offset estimation value between the source base station, determines frequency deviation coefficient.
Specifically, in step S202, specified load of the user equipment 1 according to the source base station acquired in step s 201
Wave frequency rate, and the offset estimation value between the user equipment 1 and the source base station is combined, such as the frequency obtained beforehand through offset estimation
Inclined estimate, by certain calculating, determines frequency deviation coefficient.For example, it is assumed that user equipment is with the offset estimation value of source base station
foffset1, the specified transmission frequency of source base station is fsource_cell；The specified tranmitting frequency of target BS is ftarget_cell, Yong Hushe
The standby initial frequency offset value with the target BS is fInit_offset2, then user equipment 1 by calculate, determine frequency deviation coefficient
In step S203, user equipment 1 combines the target corresponding to the user equipment according to the frequency deviation coefficient
The designated carrier frequency of base station, estimates the initial frequency offset value of the user equipment and the target BS, wherein, the target base
Designated carrier frequency of the designated carrier frequency stood different from the source base station.
Specifically, in step S203, user equipment 1 is interacted by with target BS, obtains the finger of the target BS
Determine carrier frequency, and then, according to frequency deviation coefficient is determined in step S202, by certain calculating, estimate that the user sets
The standby initial frequency offset value with the target BS, for example, user equipment 1 is according to the identified frequency deviation coefficient in step S202Estimate its initial frequency offset value f with target BSInit_offset2=pftarget_cell。
Wherein, the designated carrier frequency of the target BS is different from the designated carrier frequency of the source base station, such as works as target base
The base station stood corresponding to UTRAN, source base station is the base station corresponding to E-UTRAN, then both designated carrier frequencies are different
's.
An embodiments of the invention described below：
If for example, user equipment switches to UTRAN from E-UTRAN, and user equipment obtains different local using VCO
Carrier frequency.The voltage-controlled oscillator is the electro coupled oscillator that frequency of oscillation is controlled by input voltage, it is assumed that its precision is
The designated carrier frequency of 3ppm (precision may be changed due to temperature, aging etc.), E-UTRAN is 2.3GHz；UTRAN's
Designated carrier frequency is 2GHz.Then the preferable frequency deviation between user equipment and E-UTRAN should be 3ppm*2.3GHz=6.9kHz,
Preferable frequency deviation between user equipment and UTRAN should be 3ppm*2Ghz=6kHz.
1) before the handover, it is assumed that frequency deviation of the user equipment by it between E-UTRAN converges to 6.9kHz, therefore frequency system
Number
2) user equipment carries the frequency deviation coefficient in handoff procedure, and the frequency deviation coefficient such as is stored in into public buffer,
Wherein, the public caching is may have access to when the user equipment is located at the source base station with cell corresponding to the target BS
Device；
3) after handover, user equipment, will initially frequently according to the frequency deviation coefficient and the designated carrier frequency of the target BS
It is set to partially
Therefore, residual frequency difference is smaller, and cell identification is faster.Additionally, user equipment can be convergent faster by frequency deviation.
Offset estimation convergence curve when Fig. 3 shows typically to have a suitable initial frequency offset value.It shows that user sets
It is standby to need (t2-t1) (such as (t2-t1)=20ms) time Convergence to f1(such as f1=6kHz).
Table 3 shows the handover success rate of different test parameters.Test parameter refers to table 1 (from standard 3GPP36.133：
A.5.2.1E-UTRAN FDD-UTRAN FDD switchings).
Table 3：Handover success rate under different test parameters
| Initial residual frequency difference | Propagation conditions | Success rate |
| 0Hz | AWGN | 100% |
| 0Hz | CASE4 | 100% |
| 200Hz | AWGN | 95% |
| 200Hz | CASE4 | 85% |
| 6kHz | AWGN | 90% |
| 6kHz | CASE4 | 60% |
From the table, if initial frequency offset value is arranged to zero, initial residual frequency difference would is that a very big value, such as
6kHz。
If initial frequency offset value is set by the method for the invention, initial residual frequency difference will be controlled in very little
Value, even such as 200Hz or 0Hz.
Therefore, using the method for the invention, handover success rate will have larger lifting.
Preferably, the user equipment 1 is according to its initial frequency offset value with the target BS, and combines the target BS
Designated carrier frequency, generate the local carrier frequency of the user equipment；The local carrier frequency is set with the user
Standby received aerial signal carries out Frequency mixing processing, determines the baseband signal of the user equipment；According to the baseband signal,
Cell identification process is carried out to the cell corresponding to the target BS.
Specifically, the user equipment 1 is according to estimated its initial frequency offset value between target BS in step S203,
In conjunction with its designated carrier frequency for interacting the target BS for being obtained with target BS, by VCO thereon, generation is originally
Ground carrier frequency；And then, the aerial signal that the user equipment 1 is received in conjunction with it, to the aerial signal and the local carrier
Frequency carries out Frequency mixing processing, obtains the baseband signal of the user equipment；Then, the user equipment 1 is right further according to the baseband signal
Cell corresponding to the target BS carries out cell identification process.
Preferably, after cell identification success, user equipment 1 performs automatic frequency calibration operation；Wherein, the automatic frequency
Rate calibration operation includes that circulation performs following steps：
- according to the baseband signal, based on the cell information that the cell identification process is obtained, carry out at offset estimation
Reason, to obtain frequency offset estimation result；
- according to the frequency offset estimation result, and with reference to the designated carrier frequency of the target BS, generate the user and set
Standby local carrier frequency；
- Frequency mixing processing is carried out to the local carrier frequency and the aerial signal received by the user equipment, update
The baseband signal.
And then, the user equipment 1 repeats aforesaid operations, i.e. the user equipment 1 again based on the baseband signal after the renewal
Based on the baseband signal after the renewal, and the cell information obtained with reference to cell identification process, offset estimation treatment is carried out, obtain
Obtain frequency offset estimation result；According to the frequency offset estimation result, and with reference to the designated carrier frequency of the target BS, generate the user and set
Standby local carrier frequency；Frequency mixing processing is carried out to the aerial signal received by the local carrier frequency and the user equipment,
Continue to update the baseband signal；And then, continue according to the baseband signal after the renewal, offset estimation treatment is carried out, obtain frequency
Inclined estimated result.Here, the user equipment is after cell identification success, circulation performs the automatic frequency calibration operation, even if institute
The frequency offset estimation result for stating user equipment is equal to the initial frequency offset value, and the automatic frequency calibration operation will not also stop, only not
Cross after frequency deviation convergence, frequency offset estimation result can tend towards stability.
Here, the process for obtaining frequency offset estimation result can be refined as first obtaining a changing value Δ, and then, according to the changing value
Δ, updates the frequency offset estimation result.
Preferably, after cell identification success, the user equipment 1 execution system frame number (SFN, System Frame
Number) decoding operate obtains operation with measurement report.For example, under WCDMA system, user equipment is by solving broadcast channel
BCH (Broadcast Channel) obtains SFN；User equipment is by solving CPICH Common Pilot Channel CPICH (Common Pilot
Channel measured value) is obtained, and the measured value is reported, to generate measurement report.
Preferably, the frequency deviation coefficient is stored in public buffer by the user equipment 1, wherein, the user equipment position
The public buffer is may have access to when the source base station is with cell corresponding to the target BS.For example, in step S202
In, user equipment 1 it is determined that after frequency deviation coefficient, the frequency deviation coefficient is stored in into the public buffer, in step S203, when
After the user equipment 1 switches to the target BS from the source base station, the user equipment 1 extracts this frequently from the public buffer
Parital coefficient, according to the frequency deviation coefficient, and with reference to the designated carrier frequency of the target BS, estimates the user equipment and the target base
The initial frequency offset value stood, wherein, the designated carrier frequency of the designated carrier frequency of the target BS different from the source base station.
Fig. 4 show according to a further aspect of the present invention for carrying out setting for offset estimation at user equipment switching cell
Standby schematic diagram.User equipment 1 includes acquisition device 401, determining device 402 and estimation unit 403.
Wherein, acquisition device 401 in user equipment 1 obtains the designated carrier of the source base station corresponding to user equipment frequently
Rate.
Acquisition device 401 in user equipment 1 is interacted by with source base station, obtains the designated carrier of the source base station frequently
Rate, for example, source base station is put into the specific fields of higher layer message by being assigned carrier frequency, and the higher layer message is passed through
The mode of agreement, sends to user equipment 1, after user equipment 1 receives the higher layer message, in the specific fields of the higher layer message
Extract the designated carrier frequency of the source base station.Here, the higher layer message corresponding to different communication systems is typically different.For example when
User equipment from LTE system be switched to WCDMA system when, user equipment by LTE system broadcast message system information block SIB
Obtain the corresponding designated carrier frequencies of the LTE, the system information block such as SIB6, different system cell information again, there is provided UTRAN
Cell relevant parameter, correlated carrier wave information again.
Determining device 402 in user equipment 1 sets according to the designated carrier frequency of the source base station with reference to the user
It is standby with the offset estimation value between the source base station, determine frequency deviation coefficient.
The designated carrier of the source base station of determining device 402 in user equipment 1 according to acquired in acquisition device 401 is frequently
Rate, and the offset estimation value between the user equipment 1 and the source base station is combined, as the frequency deviation obtained beforehand through offset estimation is estimated
Evaluation, by certain calculating, determines frequency deviation coefficient.For example, it is assumed that user equipment is with the offset estimation value of source base station
foffset1, the specified transmission frequency of source base station is fsource_cell；The specified tranmitting frequency of target BS is ftarget_cell, Yong Hushe
The standby initial frequency offset value with the target BS is fInit_offset2, then user equipment 1 by calculate, determine frequency deviation coefficient
Estimation unit 403 in user equipment 1 combines the mesh corresponding to the user equipment according to the frequency deviation coefficient
The designated carrier frequency of base station is marked, the initial frequency offset value of the user equipment and the target BS is estimated, wherein, the target
Designated carrier frequency of the designated carrier frequency of base station different from the source base station.
Specifically, estimation unit 403 in user equipment 1 is interacted by with target BS, obtains the target BS
Designated carrier frequency, and then, frequency deviation coefficient is determined according to determining device 402, by certain calculating, estimate that the user sets
The standby initial frequency offset value with the target BS, for example, the frequency deviation coefficient according to determined by determining device 402 of user equipment 1Estimate its initial frequency offset value f with target BSInit_offset2=pftarget_cell。
Wherein, the designated carrier frequency of the target BS is different from the designated carrier frequency of the source base station, such as works as target base
The base station stood corresponding to UTRAN, source base station is the base station corresponding to E-UTRAN, then both designated carrier frequencies are different
's.
An embodiments of the invention described below：
If for example, user equipment switches to UTRAN from E-UTRAN, and user equipment obtains different local using VCO
Carrier frequency.The voltage-controlled oscillator is the electro coupled oscillator that frequency of oscillation is controlled by input voltage, it is assumed that its precision is
The designated carrier frequency of 3ppm (precision may be changed due to temperature, aging etc.), E-UTRAN is 2.3GHz；UTRAN's
Designated carrier frequency is 2GHz.Then the preferable frequency deviation between user equipment and E-UTRAN should be 3ppm*2.3GHz=6.9kHz,
Preferable frequency deviation between user equipment and UTRAN should be 3ppm*2Ghz=6kHz.
1) before the handover, it is assumed that frequency deviation of the user equipment by it between E-UTRAN converges to 6.9kHz, therefore frequency system
Number
2) user equipment carries the frequency deviation coefficient in handoff procedure, and the frequency deviation coefficient such as is stored in into public buffer,
Wherein, the public caching is may have access to when the user equipment is located at the source base station with cell corresponding to the target BS
Device；
3) after handover, user equipment, will initially frequently according to the frequency deviation coefficient and the designated carrier frequency of the target BS
It is set to partially
Therefore, residual frequency difference is smaller, and cell identification is faster.Additionally, user equipment can be convergent faster by frequency deviation.
Preferably, the user equipment 1 also includes generating means (not shown), mixer device (not shown) and cell identification dress
Put (not shown).The generating means combine the finger of the target BS according to its initial frequency offset value with the target BS
Determine carrier frequency, generate the local carrier frequency of the user equipment；Mixer device is to the local carrier frequency and the use
Aerial signal received by the equipment of family carries out Frequency mixing processing, determines the baseband signal of the user equipment；Cell identification device
According to the baseband signal, cell identification process is carried out to the cell corresponding to the target BS.
Specifically, its according to estimated by estimation unit 203 of the generating means in the user equipment 1 is between target BS
Initial frequency offset value, in conjunction with its designated carrier frequency for interacting the target BS for being obtained with target BS, by thereon
VCO, generate local carrier frequency；And then, the aerial signal that the mixer device in the user equipment 1 is received in conjunction with it,
Frequency mixing processing is carried out to the aerial signal and the local carrier frequency, the baseband signal of the user equipment is obtained；Then, the user
Cell identification device in equipment 1 carries out cell identification further according to the baseband signal to the cell corresponding to the target BS
Treatment.
Preferably, the user equipment 1 also includes calibrating installation (not shown).After cell identification success, in user equipment 1
Calibrating installation perform automatic frequency calibration operation；Wherein, the automatic frequency calibration operation includes that circulation performs following operation：
- according to the baseband signal, based on the cell information that the cell identification process is obtained, carry out at offset estimation
Reason, to obtain frequency offset estimation result；
- according to the frequency offset estimation result, and with reference to the designated carrier frequency of the target BS, generate the user and set
Standby local carrier frequency；
- Frequency mixing processing is carried out to the local carrier frequency and the aerial signal received by the user equipment, update
The baseband signal.
And then, the calibrating installation in the user equipment 1 repeats aforesaid operations again based on the baseband signal after the renewal, i.e.
Calibrating installation in the user equipment 1 is based on the baseband signal after the renewal, and the cell obtained with reference to cell identification process
Information, carries out offset estimation treatment, obtains frequency offset estimation result；According to the frequency offset estimation result, and combine the target BS
Designated carrier frequency, generates the local carrier frequency of the user equipment；The local carrier frequency is received with the user equipment
To aerial signal carry out Frequency mixing processing, continue to update the baseband signal；And then, continue according to the base band letter after the renewal
Number, offset estimation treatment is carried out, obtain frequency offset estimation result.Here, calibrating installation in the user equipment 1 cell identification into
After work(, circulation performs the automatic frequency calibration operation, even if the frequency offset estimation result of the user equipment is equal to the initial frequency
Bias, the automatic frequency calibration operation will not also stop, and only after frequency deviation convergence, frequency offset estimation result can tend towards stability.
Here, the process for obtaining frequency offset estimation result can be refined as first obtaining a changing value Δ, and then, according to the changing value
Δ, updates the frequency offset estimation result.
Preferably, the user equipment 1 also include decoding apparatus (not shown), the decoding apparatus cell identification success after,
The execution system frame number of user equipment 1 (SFN, the System Frame Number) decoding operate obtains operation with measurement report.Example
Such as, under WCDMA system, user equipment obtains SFN by solving broadcast channel BCH (Broadcast Channel)；User equipment
Measured value is obtained by solving CPICH Common Pilot Channel CPICH (Common Pilot Channel), and the measured value is reported, with life
Into measurement report.
Preferably, the user equipment 1 also includes storage device (not shown), and the storage device stores the frequency deviation coefficient
In public buffer, wherein, when the user equipment is located at the source base station with cell corresponding to the target BS
Access the public buffer.For example, the determining device 402 in user equipment 1 will be it is determined that after frequency deviation coefficient, the storage device will
The frequency deviation coefficient is stored in the public buffer, after the user equipment 1 switches to the target BS from the source base station, the use
Estimation unit 403 in family equipment 1 extracts the frequency deviation coefficient from the public buffer, and according to the frequency deviation coefficient, and combination should
The designated carrier frequency of target BS, estimates the initial frequency offset value of the user equipment and the target BS, wherein, the target BS
Designated carrier frequency different from the source base station designated carrier frequency.
It should be noted that the present invention can be carried out in the assembly of software and/or software with hardware, for example, can adopt
Realized with application specific integrated circuit (ASIC), general purpose computer or any other similar hardware device.In one embodiment
In, software program of the invention can be by computing device realizing steps described above or function.Similarly, it is of the invention
Software program (including related data structure) can be stored in computer readable recording medium storing program for performing, for example, RAM memory,
Magnetically or optically driver or floppy disc and similar devices.In addition, some steps of the invention or function can employ hardware to realize, example
Such as, coordinate so as to perform the circuit of each step or function as with processor.
In addition, a part of the invention can be applied to computer program product, such as computer program instructions, when its quilt
When computer is performed, by the operation of the computer, the method according to the invention and/or technical scheme can be called or provided.
And the programmed instruction of the method for the present invention is called, it is possibly stored in fixed or moveable recording medium, and/or pass through
Data flow in broadcast or other signal bearing medias and be transmitted, and/or be stored according to described program instruction operation
In the working storage of computer equipment.Here, including a device according to one embodiment of present invention, the device includes using
In the memory and the processor for execute program instructions of storage computer program instructions, wherein, when the computer program refers to
When order is by the computing device, method and/or skill that the plant running is based on foregoing multiple embodiments of the invention are triggered
Art scheme.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as the claim involved by limitation.This
Outward, it is clear that " including " word is not excluded for other units or step, odd number is not excluded for plural number.The multiple stated in device claim
Unit or device can also be realized by a unit or device by software or hardware.The first, the second grade word is used for table
Show title, and be not offered as any specific order.
Claims (10)
1. a kind of method for carrying out offset estimation at user equipment switching cell, wherein, the method is comprised the following steps：
A obtains the designated carrier frequency f of the source base station corresponding to user equipmentsource_cell；
Designated carrier frequency fs of the b according to the source base stationsource_cell, and combine between the user equipment and the source base station
Offset estimation value foffset1, determine frequency deviation coefficient
C is according to the frequency deviation coefficientAnd the designated carrier of the target BS corresponding to the combination user equipment
Frequency ftarget_cell, estimate the initial frequency offset value f of the user equipment and the target BSInit_offset2=p
ftarget_cell, wherein, the designated carrier frequency of the designated carrier frequency of the target BS different from the source base station.
2. method according to claim 1, wherein, the method also includes：
- according to the initial frequency offset value of the user equipment and the target BS, and combine the designated carrier of the target BS
Frequency, generates the local carrier frequency of the user equipment；
- Frequency mixing processing is carried out with the aerial signal received by the user equipment to the local carrier frequency, it is determined that described
The baseband signal of user equipment；
- according to the baseband signal, cell identification process is carried out to the cell corresponding to the target BS.
3. method according to claim 2, wherein, the method also includes：
- after cell identification success, perform automatic frequency calibration operation；
Wherein, the automatic frequency calibration operation includes that circulation performs following steps：
- according to the baseband signal, based on the cell information that the cell identification process is obtained, offset estimation treatment is carried out,
To obtain frequency offset estimation result；
- according to the frequency offset estimation result, and with reference to the designated carrier frequency of the target BS, generate the user equipment
Local carrier frequency；
- Frequency mixing processing is carried out to the local carrier frequency and the aerial signal received by the user equipment, update described
Baseband signal.
4. according to the method in claim 2 or 3, wherein, the method also includes：
- after cell identification success, execution system frame number decoding operate obtains operation with measurement report.
5. according to the method in any one of claims 1 to 3, wherein, the method also includes：
- the frequency deviation coefficient is stored in public buffer, wherein, the user equipment is located at the source base station and the target
The public buffer is may have access to during cell corresponding to base station；
Wherein, the step c includes：
- the frequency deviation coefficient is extracted from the public buffer, according to the frequency deviation coefficient, and combine the target BS
Designated carrier frequency, estimates the initial frequency offset value of the user equipment and the target BS, wherein, the finger of the target BS
Determine designated carrier frequency of the carrier frequency different from the source base station.
6. a kind of user equipment for carrying out offset estimation at switching cell, wherein, the equipment includes：
Acquisition device, the designated carrier frequency f for obtaining the source base station corresponding to user equipmentsource_cell；
Determining device, for the designated carrier frequency f according to the source base stationsource_cell, and combine the user equipment and institute
State the offset estimation value f between source base stationoffset1, determine frequency deviation coefficient
Estimation unit, for according to the frequency deviation coefficientAnd combine the target base corresponding to the user equipment
The designated carrier frequency f for standingtarget_cell, estimate the initial frequency offset value f of the user equipment and the target BSInit_offset2
=pftarget_cell, wherein, the designated carrier frequency of the carrier frequency of the target BS different from the source base station.
7. user equipment according to claim 6, wherein, the equipment also includes：
Generating means, for the initial frequency offset value according to the user equipment and the target BS, and combine the target base
The designated carrier frequency stood, generates the local carrier frequency of the user equipment；
Mixer device, for being carried out at mixing with the aerial signal received by the user equipment to the local carrier frequency
Reason, determines the baseband signal of the user equipment；
Cell identification device, for according to the baseband signal, cell identification being carried out to the cell corresponding to the target BS
Treatment.
8. user equipment according to claim 7, wherein, the equipment also includes calibrating installation, is used for：
- after cell identification success, perform automatic frequency calibration operation；
Wherein, the automatic frequency calibration operation includes that circulation performs following operation：
- according to the baseband signal, based on the cell information that the cell identification process is obtained, offset estimation treatment is carried out,
To obtain frequency offset estimation result；
- according to the frequency offset estimation result, and with reference to the designated carrier frequency of the target BS, generate the user equipment
Local carrier frequency；
- Frequency mixing processing is carried out to the local carrier frequency and the aerial signal received by the user equipment, update described
Baseband signal.
9. the user equipment according to claim 7 or 8, wherein, the equipment also includes decoding apparatus, is used for：
- after cell identification success, execution system frame number decoding operate obtains operation with measurement report.
10. the user equipment according to any one of claim 6 to 8, wherein, the equipment also includes storage device, is used for：
- the frequency deviation coefficient is stored in public buffer, wherein, the user equipment is located at the source base station and the target
The public buffer is may have access to during cell corresponding to base station；
Wherein, the estimation unit is used for：
- the frequency deviation coefficient is extracted from the public buffer, according to the frequency deviation coefficient, and combine the target BS
Designated carrier frequency, estimates the initial frequency offset value of the user equipment and the target BS, wherein, the finger of the target BS
Determine designated carrier frequency of the carrier frequency different from the source base station.
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| CN106330803B (en) * | 2015-06-30 | 2019-09-24 | 展讯通信（上海）有限公司 | Terminal pattern switching method and terminal |
| CN109219070B (en) * | 2017-06-29 | 2022-04-29 | 展讯通信（上海）有限公司 | Supplementary service configuration method and device and electronic equipment |
| CN109067680B (en) * | 2018-09-19 | 2021-09-07 | 深圳市鼎阳科技股份有限公司 | Carrier frequency offset estimation method and device of baseband signal |
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