CN103476104B - Frequency synchronization method and device - Google Patents

Frequency synchronization method and device Download PDF

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Publication number
CN103476104B
CN103476104B CN201210188789.9A CN201210188789A CN103476104B CN 103476104 B CN103476104 B CN 103476104B CN 201210188789 A CN201210188789 A CN 201210188789A CN 103476104 B CN103476104 B CN 103476104B
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described
base station
frequency
ue
frequency deviation
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CN201210188789.9A
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CN103476104A (en
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易雄书
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/0035Synchronisation arrangements detecting errors in frequency or phase

Abstract

The present invention is applicable to moving communicating field, particularly provides a kind of frequency synchronization method and device, including: the first base station obtains the first frequency deviation, and notifies that the second base station is to described first base station feedback the second frequency deviation;Described first frequency deviation is the difference on the frequency of the UE that described first base station services with it, the pilot signal sent by the UE of its service of described first base station measurement is obtained, described second frequency deviation is that described second base station is obtained with described first base station or the difference on the frequency of the UE of described second base station service, the pilot signal sent by the UE of the first base station described in described second base station measurement or described second base station service;Described first base station, according to described first frequency deviation and the second frequency deviation, obtains the difference on the frequency of itself and described second base station so that described second base station according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.The present invention is on the premise of need not change existing protocol, and the frequency deviation that significantly simplify cooperation cell estimates flow process.

Description

Frequency synchronization method and device

Technical field

The invention belongs to moving communicating field, particularly relate to a kind of frequency synchronization method and device.

Background technology

Coordinate multipoint Combined Treatment/combine transmitting (Coordinate Multi-Point Joint Process/Joint Transmission, CoMP JP/JT) it is the weight of Long Term Evolution plan (Long Term Evolution, LTE) Rel10 Want characteristic.For FDD (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing, TDD) for pattern, under CoMP JT scheme, the Frequency Synchronization problem between its cooperative base station is crucial.Imitative True result prove when the frequency deviation of two base stations at 65Hz when, high order modulation encoding scheme (Modulation Coding Scheme, MCS) performance the most substantially deteriorates, accordingly, it would be desirable to be controlled the frequency departure between cooperative base station.

Under the CoMP JT scheme shown in Fig. 1 as a example by two cooperative base station frequency error schematic diagrams, community 11, community 12 And the frequency of subscriber equipment (User Equipment, UE) 13 is respectively f1, f2 and f3.Prior art needs first to be measured by UE After the descending pilot frequency of community 11 obtains the difference of f1 Yu f3, f3 is adjusted to f1 size, then lead by measuring the descending of community 12 Frequency obtains difference f2-f1 of f2 Yu f1, the cell ID (Cell ID) of UE feedback f2-f1 and community 12 give community 11, so that It is mutual that community 11 realizes the information with community 12 by X2 interface or privately owned serial ports, makes community 12 be adjusted by f2 to f1 size, Complete the Frequency Synchronization of community 11 and community 12.

But, said frequencies synchronization scenario needs to revise existing protocol so that UE removes to measure one by one the frequency of each cooperative base station Partially being worth and feed back corresponding cell ID, the frequency deviation considerably increasing cooperation cell estimates flow process.

Summary of the invention

The purpose of the embodiment of the present invention is to provide a kind of frequency synchronization method, it is intended to solves prior art and causes cooperating little The frequency deviation in district estimates the problem that flow process is complicated.

The embodiment of the present invention is achieved in that a kind of frequency synchronization method, including:

First base station obtains the first frequency deviation, and notifies that the second base station is to described first base station feedback the second frequency deviation;Described One frequency deviation is the difference on the frequency of the user equipment (UE) that described first base station services with it, by its service of described first base station measurement The pilot signal that UE sends obtains, and described second frequency deviation is described second base station and described first base station or described second base station The difference on the frequency of the UE of service, is sent by the UE of the first base station described in described second base station measurement or described second base station service Pilot signal obtain;

Described first base station, according to described first frequency deviation and the second frequency deviation, obtains the difference on the frequency of itself and described second base station, And described difference on the frequency is sent to described second base station so that described second base station according to described difference on the frequency by the frequency of self Synchronize the frequency for described first base station.

The another object of the embodiment of the present invention is to provide a kind of frequency synchronization device, including:

First frequency deviation acquiring unit, obtains the first frequency deviation, and notifies that the second base station is to described first base for the first base station Feedback of standing the second frequency deviation;Described first frequency deviation is the difference on the frequency of the user equipment (UE) that described first base station services with it, by institute Stating the pilot signal that UE of its service of the first base station measurement sends to obtain, described second frequency deviation is described second base station and described the The difference on the frequency of the UE of one base station or described second base station service, by the first base station or institute described in described second base station measurement State the pilot signal acquisition that the UE of the second base station service sends;

Difference on the frequency acquiring unit, for described first base station according to described first frequency deviation and the second frequency deviation, obtains itself and institute State the difference on the frequency of the second base station, and described difference on the frequency is sent to described second base station, so that described second base station is according to institute State difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.

The frequency synchronization method that the embodiment of the present invention provides is initiated, by UE to each cooperative base station by the first base station preset Pilot signal transmitted, cooperative base station by after measuring this pilot signal to the frequency deviation of its UE serviced with it of the first base station feedback, Make the first base station can calculate the difference on the frequency between each second base station and the first base station, thus according to the frequency deviation information of feedback Realizing Frequency Synchronization, on the premise of need not change existing protocol, the frequency deviation that significantly simplify cooperation cell estimates flow process.

The another object of the embodiment of the present invention is to provide a kind of frequency synchronization method, including:

Second base station receives the first frequency deviation that the first base station sends, and obtains described second base station or described second base station And the second frequency deviation of at least one other the second base station, described first frequency deviation is the subscriber equipment that described first base station services with it The difference on the frequency of UE, the pilot signal sent by UE of its service of described first base station measurement is obtained, and described second frequency deviation is the Two base stations and described first base station or the difference on the frequency of the UE of described second base station service, described in described second base station measurement The pilot signal that the UE of the first base station or described second base station service sends obtains;

Described second base station, according to described first frequency deviation and the second frequency deviation, obtains the difference on the frequency of itself and described first base station, And according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.

The another object of the embodiment of the present invention is to provide a kind of frequency synchronization device, including:

Second frequency deviation acquiring unit, receives the first frequency deviation that the first base station sends, and obtains described for the second base station Two base stations or described second base station and the second frequency deviation of at least one other the second base station, described first frequency deviation is described first The difference on the frequency of the user equipment (UE) that base station services with it, the pilot signal sent by the UE of its service of described first base station measurement Obtaining, described second frequency deviation is the second base station and described first base station or the difference on the frequency of the UE of described second base station service, logical Cross the pilot signal acquisition that the UE of the first base station described in described second base station measurement or described second base station service sends;

Lock unit, for described second base station according to described first frequency deviation and the second frequency deviation, obtains it with described first The difference on the frequency of base station, and according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.

In the embodiment of the present invention, the first base station is by sending the first of the UE that the first base station services with it to each second base station Frequency deviation, triggers each second base station by obtaining himself and the second frequency deviation of other the second base stations, actively to itself and the first base Difference on the frequency between standing calculates, and thereby reduces the information interaction amount between the first base station and the second base station, simplifies friendship Flow process mutually, on the premise of need not change existing protocol, the frequency deviation that significantly simplify cooperation cell estimates flow process.

Accompanying drawing explanation

Fig. 1 is two cooperative base station frequency error schematic diagrams under the CoMP JT scheme that prior art provides;

Fig. 2 is the system environments schematic diagram that the frequency synchronization method that the embodiment of the present invention provides is suitable for;

Fig. 3 is the flowchart of frequency synchronization method the first base station that first embodiment of the invention provides;

Fig. 4 is SRS and PUSCH scheduling resource block (Resource Block, the RB) weight of the UE that the embodiment of the present invention provides Close schematic diagram;

Fig. 5 is the preferred implementation flow chart of frequency synchronization method step S301 that first embodiment of the invention provides;

Fig. 6 is the flowchart of frequency synchronization method the second base station that first embodiment of the invention provides;

Fig. 7 is the structured flowchart of the frequency synchronization device that first embodiment of the invention provides;

Fig. 8 is the flowchart of frequency synchronization method the second base station that second embodiment of the invention provides;

Fig. 9 is the preferred implementation flow chart of frequency synchronization method step S801 that second embodiment of the invention provides;

Figure 10 is the structured flowchart of the frequency synchronization device that second embodiment of the invention provides.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and It is not used in the restriction present invention.

Fig. 2 shows the system environments schematic diagram that the frequency synchronization method that the embodiment of the present invention provides is suitable for, in order to just In explanation, illustrate only part related to the present embodiment.

With reference to Fig. 2, community 1 therein, community 2 ..., community n are as static cooperation collection, when multiple UE enter this cooperation Being serviced by multiple different communities respectively after collection, such as, some UE is serviced by community 1 and community 2, and some is by community 2 and little District 3 services, and some UE Ze Bei community 1, community 2 and community 3 service simultaneously.The frequency synchronization method that the embodiment of the present invention provides is i.e. It is intended to solve the Frequency Synchronization problem of above-mentioned collaboration set Zhong Ge community.

What Fig. 3 showed the frequency synchronization method that first embodiment of the invention provides realizes flow process.The embodiment of the present invention carries The frequency synchronization method of confession is initiated, by UE to each cooperative base station pilot signal transmitted, cooperative base station by the first base station preset By after measuring this pilot signal to the frequency deviation of its UE serviced with it of the first base station feedback so that the first base station can be according to instead The frequency deviation information of feedback calculates the difference on the frequency between each second base station and the first base station, is achieved in Frequency Synchronization, need not On the premise of changing existing protocol, the frequency deviation that significantly simplify cooperation cell estimates flow process.

The executive agent of the present embodiment is the first default base station, and this first base station is positioned at as shown in Figure 2 one of them Community, and this community is default main plot, the purpose of the present embodiment is i.e. will be located in the frequency of the second base station of other communities Rate synchronizes the frequency for this first base station.Details are as follows for concrete implementation flow process:

In step S301, the first base station obtains the first frequency deviation, and notifies that the second base station is to described first base station feedback Two frequency deviations;Described first frequency deviation is the difference on the frequency of the UE that described first base station services with it, by described first base station measurement its The pilot signal that the UE of service sends obtains, and described second frequency deviation is described second base station and described first base station or described the The difference on the frequency of the UE of two base station services, is serviced by the first base station described in described second base station measurement or described second base station The pilot signal that UE sends obtains.

In the present embodiment, each UE can launch the pilot signal being available for carrying out frequency deviation measurement.First base station can be passed through The pilot signal that UE launches obtains first frequency deviation of each UE himself serviced with it, and each second base station can also be by surveying The pilot signal that amount UE sends obtains corresponding second frequency deviation.Wherein, the pilot signal of the second base station measurement can be by the first base The UE of the service of standing sends, it is also possible to sent by the UE of the second base station service.The acquisition of frequency deviation by each base station by measure one UE or measure the frequency of pilot signal that multiple UE of its service send respectively, and calculate this pilot signal frequencies and each base The difference of own frequency of standing obtains, specifically:

Two channel estimation values utilizing pilot signal to obtain the most in the same time are:

H n ( k ) = a ( k ) e j φ n ( k )

H n + m ( k ) = b ( k ) e j φ n + m ( k )

Wherein k represents that subcarrier number, n represented for the n-th moment, and a (k) represents the amplitude that n moment subcarrier k upper signal channel is estimated Part, φnK () is phase bit position.

Δtn_n+m=tn+m-tn

ΔH = Σ k = 0 N - 1 H n + m ( k ) · H n * ( k ) , 0 ≤ k ≤ N - 1

Δφ=∠(ΔH)

Then frequency deviation measurement value be: Δf = Δφ 2 πΔ t n _ n + m .

The principle that implements obtaining frequency deviation above by pilot signal measurement is not used in the restriction present invention, the most superfluous at this State.

For pilot signal, as one embodiment of the present of invention, it can be the detection reference signal of UE transmitting (Sounding Reference Signal, SRS).When using SRS as pilot signal, in order to improve the precision of measurement, can To use the quality of following several ways raising SRS:

1, the transmitting power of SRS is improved;

2, the scheduling bandwidth of SRS is reduced;

3, trigger SRS and reconfigure to shorten the transmitting cycle of SRS, such as, make SRS carry out one with 5ms or 2ms for the cycle Secondary reconfigure;

4, make the second base station in collaboration set mourn in silence in certain time domain or frequency domain resource in predetermined period, do not launch SRS, the only first Base Transmitter SRS, and then avoid the SRS of identical networking minizone to disturb.

As another embodiment of the present invention, when there is up CoMP and receiving, pilot signal can also be the up of UE Demodulated reference signal (Demodulation Reference Signal, DMRS).Due to Physical Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH) and physical uplink control channel (Physical Uplink Control Channel, PUCCH) demodulation itself need to carry out frequency offset correction, therefore use the DMRS will not as pilot signal Frequency deviation is brought to estimate the extra increase of flow process complexity.

As another embodiment of the present invention, the signal that its up channel is launched can also be entered by pilot signal for base station Row detection, decode and recompile after the signal that obtains, wherein, up channel includes but not limited to PUSCH, uplink control message (Uplink Control Information, UCI) or PUCCH, in this no limit.In the present embodiment, each base station energy Get through corresponding process on enough row channels directly over and measure pilot signal, be derived from frequency deviation and estimate.

As another embodiment of the present invention, it is the most several that pilot signal can also include in above-mentioned pilot signal simultaneously Signal.Include as a example by DMRS and SRS by pilot signal, as long as SRS and the PUSCH scheduling RB of UE has coincidence (feelings as shown in Figure 4 Condition), i.e. may utilize SRS and DMRS combination and carry out frequency deviation estimation, such as, on frequency domain, carry out simple average treatment or weighting Sum-average arithmetic process, and carry out in time domain alpha filtering estimate corresponding frequency deviation value, due to pilot signal in the present embodiment Time domain density improve, therefore can improve further frequency deviation estimate precision.

As one embodiment of the present of invention, described first frequency deviation is sent by the UE of its service of described first base station measurement Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described first base station Described first frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or described second frequency deviation passes through The pilot signal that the UE of the first base station described in described second base station measurement or described second base station service sends obtains, described survey Amount includes one-shot measurement or repetitive measurement, when taking multiple measurements, and multiple frequencies that measurement is obtained by described second base station Difference gets described second frequency deviation after carrying out statistical disposition, thus improves the certainty of measurement to pilot signal, to anti-interference shadow Ring.The mode of statistical disposition includes but not limited to multiple difference on the frequencies carry out alpha Filtering Processing, average treatment or slides flat All process, in this no limit.

Meanwhile, as one embodiment of the present of invention, leading that one of them UE of its service of the first base station measurement sends Frequently, during signal, the signal on the time-frequency location of this pilot signal of other UE in the collaboration set community at its place can be closed Launch, to reduce signal disturbing, improve certainty of measurement.

In the implementing of said process of the present embodiment step S301, when the second base station is to the first base station feedback phase During the second frequency deviation answered, need to feed back to the device identification of the first base station UE corresponding with this frequency deviation, in order to the first base simultaneously Station know concrete a certain second frequency deviation corresponding be second frequency deviation of certain UE concrete that the second base station services with it, to enter one Step carries out the calculating of subsequent frequencies difference.

In step s 302, described first base station, according to described first frequency deviation and the second frequency deviation, obtains it with described second The difference on the frequency of base station, and described difference on the frequency is sent to described second base station, so that described second base station is according to described frequency Difference is by frequency that the Frequency Synchronization of self is described first base station.

In the present embodiment, corresponding second frequency deviation, after having measured the second frequency deviation, is returned to by each second base station One base station, the first base station can be calculated by corresponding, get the difference on the frequency of each second base station and the first base station.Concrete Difference on the frequency acquisition process, by being illustrated in follow-up embodiment, is not repeated herein.

As one embodiment of the present of invention, the first base station can also only get itself and one or several second bases The difference on the frequency stood, after these second base stations complete Frequency Synchronization, other second base stations being also not fully complete Frequency Synchronization are permissible According to the method described in Fig. 3 embodiment, directly be complete the second synchronization base station and carry out Frequency Synchronization, to reduce the The workload of one base station and mutual flow.

In the present embodiment, the privately owned communication interface within hardware between the first base station and the second base station, all can be passed through, It is mutual that the base band of the most multiple communities hardware plate altogether realizes information, it is also possible to by X2 interface, (hardware of multiple communities is geographical In the case of separation) to realize information mutual.

As one embodiment of the present of invention, the first base station can notify to each after directly being quantified by corresponding difference on the frequency Second base station, is converted to corresponding voltage-controlled information of voltage by the second base station by the frequency difference information received, further according to accordingly Voltage-controlled information of voltage adjusts the frequency of base station crystal oscillator..

As another embodiment of the present invention, corresponding difference on the frequency can be converted to corresponding voltage-controlled voltage by the first base station Reinform after information to each second base station, each second base station directly adjust base station according to corresponding voltage-controlled information of voltage brilliant The frequency shaken, thus snap in the frequency of the first base station.Now, the second base station directly can be carried out by the information got Adjust, be adjusted by obtaining frequency difference information compared to the second base station, simplify the handling process of the second base station.

As one embodiment of the present of invention, the pilot tone that described first base station sends at one of them UE measuring its service During signal, close the signal on the time-frequency location of described pilot signal of other UE in its cooperation set cell, place and send out Penetrate.

Fig. 5 shows a kind of preferred implementation of step S301 of the present invention, and details are as follows:

Notify that in described first base station each second base station, before described first base station feedback the second frequency deviation, also includes:

Step S501: the ginseng of described second base station that the UE measurement of the described first base station service of described first base station acquisition is arrived Examine signal measurements.

In cooperation set cell, the community 0 in may being gathered by cooperation due to part UE, community 1, community 2 ... in One or more service simultaneously, as a example by UE0 is serviced by community 0, community 1 and community 2 simultaneously, now, UE0 can distinguish Measure the reference signal measured value of above three cell base station, and send corresponding reference to each cell base station servicing it Signal measurement information, thus, each base station i.e. can get this community, place, base station of reporting of UE of its service and adjacent area Reference signal metrical information.Wherein, reference signal metrical information includes the reference signal measured value of base station, this UE that UE measurement arrives Device identification and this UE measured by the mark of the community residing for base station.First base station can be believed by the reference that UE measurement is arrived Number metrical information knows its UE serviced by which base station is serviced, and checks other bases measured by its UE serviced The reference signal measured value stood.Wherein, in LTE system, this reference signal measured value can be Reference Signal Received Power (Reference Signal Receiving Power, RSRP), and access (Worldwide in worldwide interoperability for microwave Interoperability for Microwave Access, WIMAX) in system, this reference signal measured value can be to receive Signal intensity indicates (Received Signal Strength Indication, RSSI) or carrier wave and interference+noise ratio (Carrier to Interference+Noise Ratio, CINR), concrete reference signal measured value can be according to communication system Difference and different, in this no limit.

Alternatively, predetermined threshold value can be passed through in described first base station, only obtains the reference letter more than this predetermined threshold value Number measured value, to reduce the memory space shared by the reference signal measured value got.

Correspondingly, described first base station notify the second base station to described first base station feedback the second frequency deviation, particularly as follows:

Step S502: be ranked up from high to low by the reference signal measured value got, according to described sequence notice ginseng Examine the second of this second base station of the second base station feedback corresponding to signal measurements and the UE measuring this reference signal measured value Frequency deviation, until described first base station calculates each described second base station according to described first frequency deviation got and the second frequency deviation meter Difference on the frequency with described first base station.

In the present embodiment, by the reference signal measured value that will get according to the reference signal measured value of the second base station It is ranked up from high to low, it is ensured that first feed back the quality of the pilot signal received by the second base station of the second frequency deviation Good, which thereby enhance the precision that difference on the frequency calculates.

Preferably, it is also possible in advance the reference signal metrical information got is derived or calculated in advance, by The requency sampling fjlter of all second base stations with the first base station is calculated by few step, takes with it without each second base station pair Second frequency deviation of each UE of business measures and returns, and further simplify frequency deviation and estimates flow process.

It should be noted that owing to each base station all can get the reference signal measurement letter measured by its UE serviced Breath, for the first base station, in the present embodiment step S501, when the reference signal metrical information got by himself When also cannot get the difference on the frequency of all cooperative base station, it is also possible to utilize the relevant interfaces such as such as X2 interface notify other second Himself reference signal metrical information base station initiated obtains, to be sent the UE of its service to the first base station by other second base stations Measured reference signal metrical information, so that the first base station continues with corresponding derivation Relation acquisition to each second base station Difference on the frequency, until the first base station gets the difference on the frequency of all second base stations.

As a example by the reference signal metrical information that the first base station shown in table 1 gets:

Table 1

RSRP(dBm) UE The community of A3 reporting events -80dBm UE0 Community 0 -82dBm UE0 Community 2 -83dBm UE1 Community 1 -84dBm UE1 Community 2

As shown in table 1, it is assumed that the number of cells in collaboration set is 3, in this realizes example, with the base station in community 0 Being the first base station, the base station in community 1 and community 2 is the second base station.Owing to community 0 and community 2 can be obtained by UE0 Difference on the frequency, can obtain community 1 and the difference on the frequency of community 2 by community UE1, and then can obtain community 0, community 1 and community 2 Between difference on the frequency, thus without triggering second self reference signal metrical information base station initiated by the corresponding interface further Obtain.

Table 2

RSRP(dBm) UE The community of A3 reporting events

-80dBm UE0 Community 0 -82dBm UE0 Community 2 -83dBm UE1 Community 1 -84dBm UE2 Community 0 -86dBm UE2 Community 2

And in table 2, the difference on the frequency between community 0 and community 2 can be obtained by UE0, community can also be obtained by UE2 Difference on the frequency between 0 and community 2, owing to signal quality corresponding for UE0 is more preferable, thus need not use UE2 to measure.With Time, owing to table 2 cannot obtain the community 1 difference on the frequency relative to community 0, so that the first base station notifies other the second base stations Transmit the reference signal metrical information of self, to attempt obtaining the frequency between community 1 and community 0 or between community 1 and community 2 Difference.

After the notice receiving community 0, the reference signal metrical information that community 1 gets is as shown in table 3:

Table 3

RSRP(dBm) The UE of community 1 service The community of A3 reporting events -80dBm UE0 Community 1 -82dBm UE0 Community 2 -83dBm UE1 Community 1 -84dBm UE2 Community 0 -86dBm UE2 Community 1

Pass through table 2 due to community 0 and obtained community 2 and the difference on the frequency of community 0, thus community 0 has had only to further Obtain community 1 and the difference on the frequency of community 2, i.e. can thus get community 1 and the difference on the frequency of community 0, thus realize community 0, 1, the Frequency Synchronization of 2, therefore, in this case, community 0 only need to start self reference signal by the corresponding interface triggering cell 1 The acquisition of metrical information.Being readily apparent that, the reference signal metrical information returned when community 1 still cannot make community 0 calculate During the difference on the frequency of community 1 and community 0, community 0 can be triggered other communities by the corresponding interface and be started self reference signal and measure The acquisition of information, or triggered the acquisition of self reference signal metrical information of other communities startup by the corresponding interface by community 1, Until the reference signal metrical information that community 0 gets enough calculates community 1 and the difference on the frequency of community 0.

Above relevant form only illustrates several situations that reference signal metrical information obtains, the first concrete base Reference signal of standing metrical information obtains source and can be determined according to practical situation, is not used in the restriction present invention at this.

Illustrate that embodiment illustrated in fig. 5 of the present invention realizes flow process below by a concrete implementation example:

First, the reference signal metrical information got is measured according to reference signal by the sortord shown in table 1 The size of value is ranked up from high to low.

According to the sequence 1 in table 1, the first base station first passes through frequency f measuring the pilot signal that UE0 sends0, obtain it Frequency deviation Δ f with UE0cell0,ue0:

Δfcell0,ue0=fcell0-f0

Wherein, fcell0Frequency for described first base station.

Secondly, according to sequence 2, the first base station is again by notifying cell 2, and the second base station measurement UE0 of triggering cell 2 sends Frequency f of pilot signal0, obtain the frequency deviation Δ f of itself and UE0cell2,ue0:

Δfcell2,ue0=fcell2-f0

Similarly, following first base station passes sequentially through notifying cell 1 and community 2, gets community 1 and UE1's respectively Frequency deviation:

Δfcell1,ue1=fcell1-f1

Frequency deviation with community 2 with UE1:

Δfcell2,ue1=fcell2-f1

Wherein, fcell1、fcell1And f1It is respectively the pilot signal of the frequency of community 1, the frequency of community 2 and UE1 transmitting Frequency.

So far, by four frequency deviations got above, the first base station need not down check corresponding relation, the most can Enough calculate community 2 difference on the frequency with himself:

Δfcell0,cell2=fcell0-fcell2

=fcell0-f0-(fcell2-f0)

=Δfcell0,ue0-Δfcell2,ue0

And community 1 and himself difference on the frequency:

Δfcell0,cell1=fcell0-fcell1

=fcell0-fcell2-(fcell2-fcell1)

=Δfcell0,ue0-Δfcell2,ue0-(fcell2-f1-(fcell1-f1))

=Δfcell0,ue0-Δfcell2,ue0-(Δfcell2,ue1-Δfell1,ue1)

Preferably, the difference on the frequency that upper planar survey obtains is also based on repetitive measurement and carries out statistical disposition, with further Improve certainty of measurement.Such as, alpha filtering:

Δ f ^ ( 0 ) = Δf ( 0 )

Δ f ^ ( n ) = α · Δf ( n ) + ( 1 - α ) · Δ f ^ ( n - 1 ) , n = 1,2 , · · · K

Or simple average:

Δ f ^ = 1 K Σ i = 0 K - 1 Δf ( i )

Or moving average:

Δ f ^ ( n ) = Σ i = - q p ω i Δf ( n + i ) , n = q + 1 , q + 2 , · · · , N - p , p + q + 1 = m , Σ i = - q p ω i = 1

Now, the first base station by notifying to community 1 and community 2 by corresponding difference on the frequency, so that community 1 and community 2 are right The crystal oscillator frequency of its base station is adjusted, and frequency is snapped in the frequency of community 0, it is achieved the Frequency Synchronization of cooperative base station.

By the elaboration of Fig. 3 to Fig. 5, easily learn the frequency synchronization method provided by the embodiment of the present invention, it is possible to On the premise of need not change existing protocol, the frequency deviation that significantly simplify cooperative base station in CoMP JT scheme estimates flow process, and Greatly reduce the information interaction amount between cooperative base station and between cooperative base station and UE.

What Fig. 6 showed the frequency synchronization method that first embodiment of the invention provides realizes flow process, in the present embodiment, and stream The executive agent of journey is the second base station, and details are as follows:

In step s 601, receive the first base station and indicate the second base station leading to described first base station feedback the second frequency deviation Knowing, described second frequency deviation is the difference on the frequency of the UE of the first base station described in described second base station or described second base station service.

In step S602, the pilot tone sent by measuring the UE of described first base station or described second base station service is believed Number, obtain second frequency deviation of the UE that described second base station services with it.

In step S603, the second frequency deviation got to described first base station feedback, so that described first base station obtains To its difference on the frequency with described second base station.

Related realization principle being correlated with at Fig. 3 of the present invention to embodiment illustrated in fig. 5 due to above-mentioned embodiment illustrated in fig. 6 Realize principle is illustrated, do not repeat them here.

Fig. 7 shows the structured flowchart of the frequency synchronization device that first embodiment of the invention provides, and this device is positioned at Fig. 2 institute In the first base station shown, for running the frequency synchronization method shown in Fig. 3 of the present invention to 6 embodiment, for convenience of description, only show Go out part related to the present embodiment.

With reference to Fig. 7, this device includes:

First frequency deviation acquiring unit 71, the first base station obtains the first frequency deviation, and notifies that the second base station is to described first base station Feed back the second frequency deviation;Described first frequency deviation is the difference on the frequency of the user equipment (UE) that described first base station services with it, by described The pilot signal that the UE of its service of the first base station measurement sends obtains, and described second frequency deviation is described second base station and described first Base station or the difference on the frequency of UE of described second base station service, by the first base station described in described second base station measurement or described The pilot signal that the UE of the second base station service sends obtains.

Difference on the frequency acquiring unit 72, described first base station, according to described first frequency deviation and the second frequency deviation, obtains it with described The difference on the frequency of the second base station, and described difference on the frequency is sent to described second base station, so that described second base station is according to described Difference on the frequency is by frequency that the Frequency Synchronization of self is described first base station.

Also include:

First reference signal measured value acquiring unit, described first base station obtains the UE measurement of described first base station service and arrives The reference signal measured value of described second base station.

Correspondingly,

Described first frequency deviation acquiring unit specifically for described first base station by the reference signal measured value that gets from height It is ranked up to low, according to the second base station feedback this second base station and survey corresponding to described sequence notification reference signal measurements Amount to second frequency deviation of UE of this reference signal measured value, until described first base station according to described first frequency deviation got with Second frequency deviation meter calculates the difference on the frequency of each described second base station and described first base station.

Alternatively, described first reference signal measured value acquiring unit is additionally operable to described first base station and obtains described second base The reference signal measured value of described second base station that the UE measurement of the service of standing is arrived.

Alternatively, described first reference signal measured value acquiring unit obtains more than presetting specifically for described first base station The reference signal measured value of threshold value.

Alternatively, the pilot signal that described first frequency deviation is sent by the UE of its service of described first base station measurement obtains, Described measurement includes one-shot measurement or repetitive measurement, and when taking multiple measurements, measurement is obtained many by described first base station Individual difference on the frequency gets described first frequency deviation after carrying out statistical disposition;And/or described second frequency deviation surveyed by described second base station Measuring the pilot signal acquisition that the UE of described first base station or described second base station service sends, described measurement includes one-shot measurement Or repetitive measurement, when taking multiple measurements, described second base station carries out statistical disposition to measuring the multiple difference on the frequencies obtained After get described second frequency deviation.

Alternatively, described frequency is converted to voltage-controlled electricity specifically for described first base station by described difference on the frequency acquiring unit 72 Pressure information is sent to described second base station.

Alternatively, described pilot signal is specially at least one in signals below:

SRS;DMRS;Signal in described first base station or described second base station row channel on which carries out detecting, translating The signal obtained after code and coded modulation.

Alternatively, also include:

First signal at stop unit, the pilot tone letter sent at one of them UE measuring its service for described first base station Number period, close the signal on the time-frequency location of described pilot signal of other UE in its cooperation set cell, place and launch.

The frequency synchronization method that the embodiment of the present invention provides is initiated, by UE to each cooperative base station by the first base station preset Pilot signal transmitted, cooperative base station by after measuring this pilot signal to the frequency deviation of its UE serviced with it of the first base station feedback, Make the first base station can calculate the difference on the frequency between each second base station and the first base station, thus according to the frequency deviation information of feedback Realizing Frequency Synchronization, on the premise of need not change existing protocol, the frequency deviation that significantly simplify cooperation cell estimates flow process.

What Fig. 8 showed the frequency synchronization method that second embodiment of the invention provides realizes flow process, real with the present invention first Execute unlike example, the first base station not active obtaining and the difference on the frequency of the second base station, but by sending the to each second base station First frequency deviation of the UE that one base station services with it, trigger each second base station by obtain himself and the of other the second base stations Two frequency deviations, actively calculate the difference on the frequency between itself and the first base station, thereby reduce the first base station and the second base station it Between information interaction amount, simplify interaction flow, change on the premise of existing protocol need not, significantly simplify cooperation little The frequency deviation in district estimates flow process.

The executive agent of embodiment illustrated in fig. 8 is the second base station, and it implements flow process, and details are as follows:

In step S801, the second base station receive first base station send the first frequency deviation, and obtain described second base station or Second base station described in person and the second frequency deviation of at least one other the second base station, described first frequency deviation be described first base station and its The difference on the frequency of the user equipment (UE) of service, the pilot signal sent by the UE of its service of described first base station measurement is obtained, institute Stating the second frequency deviation is the second base station and described first base station or the difference on the frequency of the UE of described second base station service, by described the The pilot signal that the UE of the first base station described in two base station measurements or described second base station service sends obtains.

As described in Fig. 3 embodiment step S301 of the present invention, for pilot signal, can be specially in signals below extremely Few one:

SRS;DMRS;Signal in described first base station or described second base station row channel on which carries out detecting, translating The signal obtained after code and coded modulation.

Related description about pilot signal is described in detail in Fig. 3 embodiment of the present invention, does not repeats them here.

As one embodiment of the present of invention, described first frequency deviation is sent by the UE of its service of described first base station measurement Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described first base station Described first frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or described second frequency deviation passes through The pilot signal that the UE of the first base station described in described second base station measurement or described second base station service sends obtains, described survey Amount includes one-shot measurement or repetitive measurement, when taking multiple measurements, and multiple frequencies that measurement is obtained by described second base station Difference gets described second frequency deviation after carrying out statistical disposition, thus improves the certainty of measurement to pilot signal, to anti-interference shadow Ring.The mode of statistical disposition includes but not limited to multiple difference on the frequencies carry out alpha Filtering Processing, average treatment or slides flat All process, in this no limit.

Meanwhile, as one embodiment of the present of invention, leading that one of them UE of its service of the second base station measurement sends Frequently, during signal, its other UE serviced signal on the time-frequency location of this pilot signal can be closed and launch, to reduce letter Number interference, improve certainty of measurement.

Fig. 9 shows a kind of preferred implementation of step S801 of the present invention, and details are as follows:

Before described second base station obtains the second frequency deviation of at least one other the second base station, also include:

Step S901: the ginseng of other the second base stations that the UE measurement of the described second base station service of described second base station acquisition is arrived Examine signal measurements;

Described second base station obtains the second frequency deviation of at least one other the second base station, particularly as follows:

Step S902: the reference signal measured value got is ranked up by described second base station from high to low, according to institute State sequence this second base station of the second base station feedback corresponding to notification reference signal measurements to measure with measuring this reference signal Second frequency deviation of the UE of value, until described second base station calculates described according to described first frequency deviation got and the second frequency deviation meter Second base station and the difference on the frequency of described first base station.

The concrete implementation principle of Fig. 9 and embodiment illustrated in fig. 5 of the present invention to realize principle identical, be not repeated herein.

In step S802, described second base station, according to described first frequency deviation and the second frequency deviation, obtains it with described first The difference on the frequency of base station, and according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.

In the present embodiment, the second base station is obtained by the second base station self with the difference on the frequency of the first base station, and second Base station gets the first frequency deviation of the first base station, and according to the first frequency deviation and at least one second base station and second frequency of its UE Partially getting the difference on the frequency of this second base station and described first base station, its concrete implementation principle is implemented with shown in Fig. 3 of the present invention Example to realize principle identical, be not repeated herein.

In the present embodiment, the first base station only need to be to all second base station broadcast the first frequency deviations, follow-up Frequency Synchronization mistake Journey is completed voluntarily by the second base station, and the first base station is made without corresponding difference on the frequency and calculates, it is not required that again with the second base Station carries out information alternately to complete the notice of difference on the frequency, alleviates the workload of the first base station.

As one embodiment of the present of invention, the first base station is except to all second base station broadcast the first frequency deviations, it is also possible to The reference of other the second base stations that the UE measurement of the first base station service got to all second base station broadcast the first base stations is arrived Signal measurements, or to all second base station broadcast the first base stations according to its get first base station service UE measurement arrive The difference on the frequency of other second base stations of being calculated of the reference signal measured value of other the second base stations and the first base station, in order to Second base station obtains the difference on the frequency of himself and the first base station in this side according to the relevant information of the first base station broadcast.

Figure 10 shows the structured flowchart of the frequency synchronization device that second embodiment of the invention provides, and this device is positioned at Fig. 2 In the second shown base station, for running the frequency synchronization method shown in Fig. 8 and Fig. 9 embodiment of the present invention, for convenience of description, Illustrate only part related to the present embodiment.

As shown in Figure 10, this device includes:

Second frequency deviation acquiring unit 1001, the second base station receives the first frequency deviation that the first base station sends, and obtains described the Two base stations or described second base station and the second frequency deviation of at least one other the second base station, described first frequency deviation is described first The difference on the frequency of the user equipment (UE) that base station services with it, the pilot signal sent by the UE of its service of described first base station measurement Obtaining, described second frequency deviation is the second base station and described first base station or the difference on the frequency of the UE of described second base station service, logical Cross the pilot signal acquisition that the UE of the first base station described in described second base station measurement or described second base station service sends.

Lock unit 1002, described second base station, according to described first frequency deviation and the second frequency deviation, obtains it with described first The difference on the frequency of base station, and according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station.

Alternatively, also include:

Second reference signal measured value acquiring unit, described second base station obtains the UE measurement of described second base station service and arrives The reference signal measured value of other the second base stations.

The reference signal measured value that described second frequency deviation acquiring unit 1001 will get specifically for described second base station It is ranked up from high to low, according to this second base station of the second base station feedback corresponding to described sequence notification reference signal measurements Second frequency deviation of the UE of this reference signal measured value is arrived, until described second base station is according to described first frequency got with measurement The difference on the frequency of described second base station and described first base station is partially calculated with the second frequency deviation meter.

Alternatively, described second reference signal measured value acquiring unit is specifically for obtaining the reference more than predetermined threshold value Signal measurements.

Alternatively, the pilot signal that described first frequency deviation is sent by the UE of its service of described first base station measurement obtains, Described measurement includes one-shot measurement or repetitive measurement, and when taking multiple measurements, measurement is obtained many by described first base station Individual difference on the frequency gets described first frequency deviation after carrying out statistical disposition;And/or described second frequency deviation surveyed by described second base station Measuring the pilot signal acquisition that the UE of described first base station or described second base station service sends, described measurement includes one-shot measurement Or repetitive measurement, when taking multiple measurements, described second base station carries out statistical disposition to measuring the multiple difference on the frequencies obtained After get described second frequency deviation.

Alternatively, described pilot signal is specially at least one in signals below:

Detection reference signal SRS;Uplink demodulation reference signal DMRS;Described first base station or described second base station are to it Signal in up channel carries out the signal detecting, decoding and obtain after coded modulation.

Alternatively, also include:

Secondary signal closing unit, the pilot tone letter sent at one of them UE measuring its service for described second base station Number period, close the signal on the time-frequency location of described pilot signal of other UE in its cooperation set cell, place and launch.

In second embodiment of the invention, the first base station not active obtaining and the difference on the frequency of the second base station, but by respectively Second base station sends first frequency deviation of the UE that the first base station services with it, triggers each second base station by obtaining himself and its Second frequency deviation of his the second base station, actively calculates the difference on the frequency between itself and the first base station, thereby reduces the first base Stand and information interaction amount between the second base station, simplify interaction flow, on the premise of need not change existing protocol, significantly Simplify cooperation cell frequency deviation estimate flow process.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.

Claims (24)

1. a frequency synchronization method, it is characterised in that including:
First base station obtains the first frequency deviation, and notifies that the second base station is to described first base station feedback the second frequency deviation;Described first frequency The difference on the frequency of the user equipment (UE) partially serviced with it for described first base station, is sent out by the UE of its service of described first base station measurement The pilot signal sent obtains, and described second frequency deviation is described second base station and described first base station or described second base station service The difference on the frequency of UE, by leading that the UE of the first base station described in described second base station measurement or described second base station service sends Frequently signal acquisition;
Described first base station, according to described first frequency deviation and the second frequency deviation, obtains the difference on the frequency of itself and described second base station, and will Described difference on the frequency is sent to described second base station so that described second base station according to described difference on the frequency by the Frequency Synchronization of self Frequency for described first base station;
Described first base station notifies that the second base station also included before described first base station feedback the second frequency deviation:
The reference signal measured value of described second base station that the UE measurement of the described first base station service of described first base station acquisition is arrived;
Described first base station notify the second base station to described first base station feedback the second frequency deviation, particularly as follows:
The reference signal measured value got is ranked up by described first base station from high to low, according to described sequence notification reference This second base station of the second base station feedback corresponding to signal measurements and the second frequency measuring the UE arriving this reference signal measured value Partially, until described first base station according to described first frequency deviation got and the second frequency deviation meter calculate each described second base station with The difference on the frequency of described first base station.
2. the method for claim 1, it is characterised in that described first base station notifies that the second base station is to described first base station Also include before feeding back the second frequency deviation:
The reference signal measured value of described second base station that the UE measurement of the described second base station service of described first base station acquisition is arrived.
3. method as claimed in claim 1 or 2, it is characterised in that the ginseng of described second base station that described acquisition UE measurement is arrived Examine signal measurements to include:
Described first base station obtains the reference signal measured value more than predetermined threshold value.
4. the method for claim 1, it is characterised in that described first frequency deviation is by its service of described first base station measurement UE send pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described First base station gets described first frequency deviation to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or
Described second frequency deviation is sent by the UE of the first base station described in described second base station measurement or described second base station service Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described second base station Described second frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition.
5. the method for claim 1, it is characterised in that described difference on the frequency is sent to described second by described first base station Base station, particularly as follows:
Described difference on the frequency is directly quantified or is converted to voltage-controlled information of voltage to be sent to described second base station by described first base station.
6. the method for claim 1, it is characterised in that described pilot signal is specially at least in signals below Kind:
Detection reference signal SRS;Uplink demodulation reference signal DMRS;Go on which in described first base station or described second base station Signal in channel carries out the signal detecting, decoding and obtain after coded modulation.
7. the method for claim 1, it is characterised in that also include:
The cooperation set of its place, during the pilot signal that one of them UE measuring its service sends, is closed in described first base station Other UE in community signal on the time-frequency location of described pilot signal is launched.
8. the method for a Frequency Synchronization, it is characterised in that including:
Second base station receives the first frequency deviation that the first base station sends, and obtains described second base station or described second base station and extremely Second frequency deviation of few other second base stations, described first frequency deviation is the user equipment (UE) that described first base station services with it Difference on the frequency, the pilot signal sent by the UE of its service of described first base station measurement is obtained, and described second frequency deviation is the second base Stand and described first base station or the difference on the frequency of the UE of described second base station service, by described in described second base station measurement first The pilot signal that the UE of base station or described second base station service sends obtains;
Described second base station, according to described first frequency deviation and the second frequency deviation, obtains the difference on the frequency of itself and described first base station, and root According to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station;
Before described second base station obtains the second frequency deviation of at least one other the second base station, also include:
The reference signal measured value of other the second base stations that the UE measurement of the described second base station service of described second base station acquisition is arrived;
Described second base station obtains the second frequency deviation of at least one other the second base station, particularly as follows:
The reference signal measured value got is ranked up by described second base station from high to low, according to described sequence notification reference This second base station of the second base station feedback corresponding to signal measurements and the second frequency measuring the UE arriving this reference signal measured value Partially, until described second base station calculates described second base station with described according to described first frequency deviation got and the second frequency deviation meter The difference on the frequency of the first base station.
9. method as claimed in claim 8, it is characterised in that the reference letter of other the second base stations that described acquisition UE measurement is arrived Number measured value includes:
Described second base station obtains the reference signal measured value more than predetermined threshold value.
10. method as claimed in claim 8, it is characterised in that described first frequency deviation is by its clothes of described first base station measurement The pilot signal that the UE of business sends obtains, and described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, and institute State the first base station and get described first frequency deviation to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or
Described second frequency deviation is sent by the UE of the first base station described in described second base station measurement or described second base station service Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described second base station Described second frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition.
11. methods as claimed in claim 8, it is characterised in that described pilot signal is specially at least in signals below Kind:
Detection reference signal SRS;Uplink demodulation reference signal DMRS;Go on which in described first base station or described second base station Signal in channel carries out the signal detecting, decoding and obtain after coded modulation.
12. methods as claimed in claim 8, it is characterised in that also include:
The cooperation set of its place, during the pilot signal that one of them UE measuring its service sends, is closed in described second base station Other UE in community signal on the time-frequency location of described pilot signal is launched.
13. 1 kinds of frequency synchronization devices, it is characterised in that including:
First frequency deviation acquiring unit, obtains the first frequency deviation, and notifies that the second base station is anti-to described first base station for the first base station Present the second frequency deviation;Described first frequency deviation is the difference on the frequency of the user equipment (UE) that described first base station services with it, by described The pilot signal that the UE of its service of one base station measurement sends obtains, and described second frequency deviation is described second base station and described first base Stand or the difference on the frequency of UE of described second base station service, by the first base station described in described second base station measurement or described the The pilot signal that the UE of two base station services sends obtains;
Difference on the frequency acquiring unit, for described first base station according to described first frequency deviation and the second frequency deviation, obtains it with described the The difference on the frequency of two base stations, and described difference on the frequency is sent to described second base station, so that described second base station is according to described frequency Rate variance is by frequency that the Frequency Synchronization of self is described first base station;
First reference signal measured value acquiring unit, the UE measurement obtaining described first base station service for described first base station is arrived The reference signal measured value of described second base station;
Described first frequency deviation acquiring unit is specifically for described first base station by the reference signal measured value that gets from high to low It is ranked up, arrives with measurement according to this second base station of the second base station feedback corresponding to described sequence notification reference signal measurements Second frequency deviation of the UE of this reference signal measured value, until described first base station is according to described first frequency deviation and second got Frequency deviation meter calculates the difference on the frequency of each described second base station and described first base station.
14. devices as claimed in claim 13, it is characterised in that described first reference signal measured value acquiring unit is additionally operable to The reference signal measured value of described second base station that the UE measurement of the described second base station service of described first base station acquisition is arrived.
15. devices as described in claim 13 or 14, it is characterised in that described first reference signal measured value acquiring unit tool Body obtains the reference signal measured value more than predetermined threshold value for described first base station.
16. devices as claimed in claim 13, it is characterised in that described first frequency deviation is by its clothes of described first base station measurement The pilot signal that the UE of business sends obtains, and described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, and institute State the first base station and get described first frequency deviation to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or
Described second frequency deviation is sent by the UE of the first base station described in described second base station measurement or described second base station service Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described second base station Described second frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition.
17. devices as claimed in claim 13, it is characterised in that described difference on the frequency acquiring unit is specifically for described first base Stand and described difference on the frequency directly quantifies or is converted to voltage-controlled information of voltage be sent to described second base station.
18. devices as claimed in claim 13, it is characterised in that described pilot signal is specially at least in signals below Kind:
Detection reference signal SRS;Uplink demodulation reference signal DMRS;Go on which in described first base station or described second base station Signal in channel carries out the signal detecting, decoding and obtain after coded modulation.
19. devices as claimed in claim 13, it is characterised in that also include:
First signal at stop unit, the pilot signal phase sent at one of them UE measuring its service for described first base station Between, close the signal on the time-frequency location of described pilot signal of other UE in its cooperation set cell, place and launch.
The device of 20. 1 kinds of Frequency Synchronization, it is characterised in that including:
Second frequency deviation acquiring unit, receives the first frequency deviation that the first base station sends, and obtains described second base for the second base station Standing or described second base station and the second frequency deviation of at least one other the second base station, described first frequency deviation is described first base station The difference on the frequency of the user equipment (UE) serviced with it, the pilot signal sent by the UE of its service of described first base station measurement is obtained Taking, described second frequency deviation is the second base station and described first base station or the difference on the frequency of the UE of described second base station service, passes through The pilot signal that the UE of the first base station described in described second base station measurement or described second base station service sends obtains;
Lock unit, for described second base station according to described first frequency deviation and the second frequency deviation, obtains itself and described first base station Difference on the frequency, and according to described difference on the frequency by frequency that the Frequency Synchronization of self is described first base station;
Second reference signal measured value acquiring unit, the UE measurement obtaining described second base station service for described second base station is arrived The reference signal measured value of other the second base stations;
Described second frequency deviation acquiring unit is specifically for described second base station by the reference signal measured value that gets from high to low It is ranked up, arrives with measurement according to this second base station of the second base station feedback corresponding to described sequence notification reference signal measurements Second frequency deviation of the UE of this reference signal measured value, until described second base station is according to described first frequency deviation and second got Frequency deviation meter calculates the difference on the frequency of described second base station and described first base station.
21. devices as claimed in claim 20, it is characterised in that described second reference signal measured value acquiring unit is specifically used The reference signal measured value more than predetermined threshold value is obtained in described second base station.
22. devices as claimed in claim 20, it is characterised in that described first frequency deviation is by its clothes of described first base station measurement The pilot signal that the UE of business sends obtains, and described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, and institute State the first base station and get described first frequency deviation to measuring after the multiple difference on the frequencies obtained carry out statistical disposition;And/or
Described second frequency deviation is sent by the UE of the first base station described in described second base station measurement or described second base station service Pilot signal obtain, described measurement includes one-shot measurement or repetitive measurement, when taking multiple measurements, described second base station Described second frequency deviation is got to measuring after the multiple difference on the frequencies obtained carry out statistical disposition.
23. devices as claimed in claim 20, it is characterised in that described pilot signal is specially at least in signals below Kind:
Detection reference signal SRS;Uplink demodulation reference signal DMRS;Go on which in described first base station or described second base station Signal in channel carries out the signal detecting, decoding and obtain after coded modulation.
24. devices as claimed in claim 20, it is characterised in that also include:
Secondary signal closing unit, the pilot signal phase sent at one of them UE measuring its service for described second base station Between, close the signal on the time-frequency location of described pilot signal of other UE in its cooperation set cell, place and launch.
CN201210188789.9A 2012-06-08 2012-06-08 Frequency synchronization method and device CN103476104B (en)

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